Modern Wisdom

#1066 - Dr Kathryn Paige Harden - The Genetics of Evil: Are People Born Bad?

March 2, 2026

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  • The intense backlash Dr. Kathryn Paige Harden experienced after her book publication stemmed largely from academic misrepresentation, contrasting sharply with the positive, personal dialogue she had with readers seeking self-understanding. 
  • A large-scale genetic study of 4 million people linked a shared genetic liability toward risk-taking, encompassing behaviors from ADHD symptoms and early sexual activity to substance use. 
  • Antisocial behavior in children, particularly when accompanied by callous-unemotional traits (childhood psychopathy), shows a heritability estimate as high as 80%, similar to schizophrenia, yet these children are the most vulnerable to escalating negative behavior when met with harsh punishment rather than connection. 
  • Holding both the scientific understanding of genetic and environmental shaping (determinism) and the necessity of interpersonal accountability (reactive attitudes) simultaneously is a difficult but crucial moral challenge for society, especially concerning crime and addiction. 
  • The public often reasons about genetic causes of behavior differently than environmental causes, sometimes viewing genetic predispositions as increasing retribution rather than mitigating culpability, which contrasts with philosophical determinism frameworks. 
  • Retribution is an evolved cooperation enforcement mechanism, evidenced by neurobiological reward responses (dopamine release) when observing suffering in perceived wrongdoers, which children and adults are willing to pay a cost to enact. 
  • The shift from genetic determinism ("my genes made me do it") to genetic essentialism ("my genes are who I truly am") changes how genetic information is perceived, potentially making bad behavior seem inherent rather than a result of luck or circumstance. 
  • The current practice of IVF already involves embryo selection based on visible traits (like aneuploidy screening), making the ethical leap to selecting for complex behavioral traits a matter of degree rather than kind. 
  • The push for societal domestication, which selects for traits like conscientiousness and lower aggression, may place a greater, unseen emotional containment burden on men whose genetic predispositions align with less domesticated traits. 
  • The 'looksmaxxing' movement among young men, driven by online presentation and perceived mate competition, appears nihilistic as it focuses on signals of formidability rather than traits conducive to long-term pair bonding and raising offspring, which are evolutionarily central. 
  • New technologies like IVF force society to grapple with tensions between values, such as the desire to reduce suffering in offspring versus the value of accepting a person as they are, independent of parental projects. 

Segments

Post-Book Controversy Reaction
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(00:00:00)
  • Key Takeaway: The author experienced two distinct dialogues post-publication: positive reader engagement and surprising, villainizing pushback from academic peers.
  • Summary: The author found the dialogue with general readers fantastic, as they related the work to personal differences from family members and decisions about parenthood. Conversely, interactions with other academics were surprising, with some needing to frame the author as a villain to advance their own messages. This experience highlighted the pain of having one’s written words deliberately misrepresented by others.
Insults and Doppelgangers
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(00:02:03)
  • Key Takeaway: Insults hurt most when the critic’s perspective might be believed by others, creating a disorienting ‘shadow page’ version of the author.
  • Summary: The speaker refutes the idea that only insults we believe hurt the most; rather, it is the fear that others might believe the misrepresentation that causes distress. This feeling is likened to novelist Sally Rooney’s concept of a doppelganger wearing one’s name and arguing the opposite. Miscommunication in relationships, where one’s intended message is completely unheard, creates a similar sense of estrangement.
The 4 Million Person Study
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(00:05:28)
  • Key Takeaway: A massive genetic study identified shared genetic liabilities across seven distinct risk-taking and rule-violating behaviors.
  • Summary: The study analyzed DNA from 4 million participants, looking for genes associated with behaviors like ADHD symptoms, early/frequent sexual activity, smoking, and problematic alcohol use. These behaviors were grouped under the umbrella of disinhibition or reward-seeking that violates social rules. The goal was to find genes generally involved in risk-taking that project across a person’s lifespan.
Evolutionary Roots of Risk
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(00:12:09)
  • Key Takeaway: Human evolution involves a tension between self-domestication favoring cooperation and the necessity of risk-taking outliers for societal progress.
  • Summary: Humans have largely self-domesticated, selecting for less aggression and more self-control compared to chimpanzees, evidenced by physiological changes like smaller canines. However, society also requires risk-takers; one study showed that among resource-advantaged young men, prior teenage delinquency was a predictor of successful entrepreneurship. This deviance pushes society forward, existing in tension with the need for cooperation.
Schizophrenia Genes and Creativity
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(00:18:31)
  • Key Takeaway: Genetic variants associated with schizophrenia are also correlated with higher likelihoods of being an artist, engineer, or musician.
  • Summary: Genes that predispose individuals toward severe mental disorders like schizophrenia may also confer advantages in creative professions. This dual effect helps keep those ‘disease genes’ circulating in the human gene pool longer, as the non-pathological expression is adaptive. The inverse is also true: severe outcomes often result from the interaction of genotype with a negative childhood environment.
Free Will vs. Culpability
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(00:25:02)
  • Key Takeaway: The functional utility of life requires acting as if free will exists, even if determinism is literally true, shifting focus from abstract free will to understanding shaping factors.
  • Summary: The person making choices is profoundly shaped by uncontrollable factors like genes and early environment, suggesting individuals operate on ’train tracks.’ The more functionally interesting question is how genes and environment shape us, and what role that plays in punishment and reward, rather than debating the existence of free will itself. A belief in free will is functionally true because acting as if one has agency improves life by preventing the outsourcing of responsibility.
Heritability of Antisocial Behavior
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(00:31:04)
  • Key Takeaway: Childhood antisocial behavior, especially with callous-unemotional traits, is highly heritable (up to 80%), yet harsh punishment is the worst predictor of improvement.
  • Summary: Antisocial behavior in children, defined as persistently violating social norms, shows heritability nearly as high as schizophrenia when callous-unemotional traits (psychopathy markers) are present. These children are the most difficult to treat effectively in psychiatry because they are less sensitive to punishment. Punishing them harshly destroys the opportunity for connection, which is the primary mechanism through which people grow and change.
Societal Confusion on Teen Culpability
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(00:44:02)
  • Key Takeaway: Society exhibits deep moral confusion regarding adolescent culpability, evidenced by simultaneously trying 15-year-old school shooters as adults while charging their parents.
  • Summary: The legal system struggles to define when an individual becomes culpable, as behavior evolves along a developmental continuum from childhood actions to adult crimes. This confusion is visible in the contradictory legal responses to adolescent violence. Successful re-entry programs for child soldiers involve rituals that balance recognizing past harm with demanding admission of responsibility, a nuance lacking in much of the US legal system.
Addiction and Radical Compassion
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(00:47:44)
  • Key Takeaway: Recovery from addiction exemplifies holding both radical compassion for one’s determined biology and a determination to take responsibility for present actions.
  • Summary: People in recovery, particularly following steps like those in AA, demonstrate a sophisticated philosophical balance: admitting powerlessness over the addiction (due to biology/brain) while simultaneously seeking forgiveness and vowing to behave differently today. This ‘both/and’ perspective is harder to apply to violence because victims exist, but it is necessary for moving beyond simple retribution.
Punishment vs. Accountability
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(01:03:24)
  • Key Takeaway: Punishment, defined as inflicting suffering for retribution, cannot be justified by science, but accountability—enforcing rules to maintain safety—remains necessary.
  • Summary: The author separates punishment (deliberate suffering) from accountability (enforcing rules to protect the community and prevent future harm). Science suggests no one inherently ‘deserves’ to suffer, which challenges the retributive nature of the US penal system. Society often falls into the ‘rescue-blame trap,’ oscillating between excusing behavior due to genetics/environment and condemning it based on the harm caused.
X Chromosome and Antisocial Genes
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(00:56:39)
  • Key Takeaway: The X chromosome is a new focus in behavioral genetics because its single copy in males makes them uniquely vulnerable to X-linked genetic variants affecting behavior.
  • Summary: A famous 1990s study showed that men in one family with a rare, non-functioning MAOA gene on the X chromosome exhibited severe antisocial violence, while their sisters were unaffected due to having a second, compensating X chromosome. This demonstrates how profoundly a single genetic change can impair moral faculties, suggesting that morality is a highly vulnerable biological faculty.
Determinism vs. Reactive Attitudes
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(01:08:09)
  • Key Takeaway: Human ethical and moral experience, characterized by reactive attitudes like blame and praise, is inescapable even if strict determinism were true.
  • Summary: The cheating partner example illustrates that people matter to each other morally, and our evolved neurobiological architecture compels us to experience ourselves and others as agents making choices. Philosopher Peter Strawson argued that reactive attitudes—resentment, blame, praise—persist regardless of whether determinism is factually true. These attitudes are fundamental to human interaction and cannot be dismissed by philosophical arguments about causation.
Genetic vs. Free Will Responsibility
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(01:09:59)
  • Key Takeaway: Attributing responsibility based on a ‘free will of the gaps’—where heritability equals lack of responsibility—is a flawed framework rejected by behavioral geneticists.
  • Summary: The idea that the portion of behavior attributable to genetics is the part one is not responsible for is a temptation akin to the ‘God of the gaps.’ The speaker asserts that the human condition involves being responsible for all of ourselves, regardless of how we came to be. This perspective should lead to greater kindness and reluctance to inflict suffering unnecessarily.
Genetic Inequality and Culpability
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(01:11:08)
  • Key Takeaway: Genetic baselines affect life outcomes, suggesting a need to re-level genetic inequality for equal access to success, which must also apply to judging misbehavior.
  • Summary: Better impulse control, often genetically influenced, leads to better outcomes in education and lower likelihood of severe disciplinary action like school suspensions. The question arises whether mitigating factors based on genetic disadvantage should apply in criminal contexts just as much as in contexts promoting success. The legal system already addresses this partially in the sentencing phase through mitigation specialists presenting environmental and biological history.
Juror Reasoning on Genetic vs. Environmental Causes
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(01:15:37)
  • Key Takeaway: Jurors tend to view environmental causes of crime as mitigating but view genetic causes of violence as increasing the need for retribution and future incarceration.
  • Summary: Experiments show that when presented with a violent crime, jurors who believe violence is inherited suggest higher prison terms, reasoning that the individual has less control and might reoffend. Environmental causes, like parental abuse, are more likely to be seen as mitigating factors. This differential reasoning about genetic versus environmental causes makes integrating genetics into legal judgment complex.
Retribution as an Evolved Mechanism
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(01:27:03)
  • Key Takeaway: The desire to make wrongdoers suffer (retribution) is an evolved cooperation enforcement mechanism linked to dopamine release upon witnessing deserved punishment.
  • Summary: Neurobiological studies show that when a person is portrayed as violating a moral norm, observers exhibit brain patterns consistent with reward when seeing that person suffer. Children as young as five will pay resources to see a ‘ball taker’ puppet physically punished, indicating a willingness to incur costs to enforce norms. This pleasure derived from punishing defectors explains the temptation to ‘other’ victims to justify inflicting pain.
Societal Responses to Extreme Crime
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(01:39:34)
  • Key Takeaway: Societies like Norway prioritize containing extreme offenders while acknowledging their inherent humanity, contrasting with US systems that often overemphasize retribution.
  • Summary: The trial of Anders Breivik in Norway, who murdered 60 children, resulted in the maximum sentence of 21 years, reflecting a societal choice to balance retribution with recognizing the perpetrator remains part of their society. This approach contrasts with the US tendency to focus punishment primarily on determining how much suffering an offender deserves. The response to harm signals the value society places on the victim and the collective’s own humanity.
Individual Agency and Scientific Explanation
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(01:53:15)
  • Key Takeaway: Individuals asking ‘Why did I do this?’ often seek narrative validation regarding their fault and hope for future change, which science’s statistical answers may not satisfy.
  • Summary: A prisoner asking a behavioral geneticist about nature versus nurture seeks a story about their own agency, fault, and potential for change, not just statistical averages. While science can explain that factors like lead exposure, abuse, and genetics increase crime likelihood, this does not address the individual’s personal narrative of self-strangeness or hope. This gap between scientific averages and individual biography remains a tension in understanding human behavior.
IVF Embryo Selection Ethics
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(02:18:44)
  • Key Takeaway: Embryo selection in IVF is already standard practice for medical reasons, shifting the ethical frontier to elective, non-medically necessary selection.
  • Summary: Doctors already eyeball and select embryos during IVF, typically screening for aneuploidies or soundness, which is considered necessary given fertility complications or age. The ethical discomfort arises more from elective IVF where selection is used to pull for positive traits rather than just avoid severe negative ones. This technological leap forces a re-evaluation of reproductive autonomy and the definition of conception.
Autism, Suffering, and Personhood
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(02:21:35)
  • Key Takeaway: Parental love coexists with the desire to mitigate a child’s suffering, even when that suffering is intrinsically linked to the child’s personhood.
  • Summary: A father’s detailed account of parenting a son with autism highlights the tension between loving the child as they are and wishing to remove genetic predispositions that cause suffering. Pro-choice individuals must ethically reconcile the status of castaway IVF embryos with the desire to select for traits that increase a child’s flourishing. New technology forces a confrontation with existing value tensions that were previously less pointed.
Polygenic Selection Thought Experiment
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(02:25:36)
  • Key Takeaway: Selecting solely against antisocial risk-taking genes could lead to a society populated by overly inhibited, puritanical individuals lacking necessary societal dynamism.
  • Summary: A thought experiment posits a dictator selecting embryos only for the lowest antisocial offending risk genes, resulting in a highly self-controlled but potentially stagnant population. Traits like risk-taking, while sometimes leading to negative outcomes, are necessary for societal evolution, as noted by sociologist Émile Durkheim. Society benefits from genetic diversity, meaning parents paying the price for high-risk traits supports the broader communal good.
Crumbling Genome Theory Debate
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(02:29:36)
  • Key Takeaway: The idea of a ‘crumbling genome’ due to modern healthcare buffering selection pressures is a recurring, though debatable, theory dating back to Galton.
  • Summary: Modern medicine alleviates selection pressures (like myopia) that historically culled suboptimal genes, leading to their accumulation, which some theorists argue requires intervention like embryo selection. This concept echoes historical arguments against universal education, which were feared to prevent the winnowing of ‘feeble-mindedness’ genes. Evolutionary fitness is always relative to the environment; traits good in one context (like a strong immune system) may not be absolutely good, especially when technology provides buffers.
Gendered Effort in Modern Society
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(02:36:44)
  • Key Takeaway: Men may exert a higher, unseen emotional containment effort to conform to modern society’s feminized standards of behavior than women do.
  • Summary: If modern society selects for traits traditionally associated with femininity (lower aggression, higher orderliness), men must exert more effort to move away from their average genetic predisposition to fit in. This required emotional containment is an unseen cost or price men pay, analogous to the ‘double shift’ often discussed for women. This perceived unfairness contributes to young men feeling a lack of valued roles in contemporary society.
Looksmaxxing and Mate Selection
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(02:49:25)
  • Key Takeaway: The looksmaxxing movement reflects young men optimizing for online-portrayable signals of formidability, which may be less relevant for long-term pair bonding than competence.
  • Summary: The irony of looksmaxxing is that some interventions, like high testosterone use, can lead to infertility, a ‘genetic sepuku.’ Research suggests that while mate value exists among strangers, the core evolutionary task centers on forming pair bonds, not out-competing strangers based on superficial signals. The shift to optimizing for online presentation means men showcase ‘chad’ status over ‘dad’ competence, which is less helpful for sustained attachment.