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

Dr. Kathryn Paige Harden discusses how genetics profoundly influence human behavior, including risk-taking and antisocial traits, highlighting the complex interplay between nature and nurture in shaping individual lives and societal responses to wrongdoing.

• Genes heavily influence behaviors like risk-taking and antisocial traits, but interact with environmental factors.

• Societal responses to wrongdoing should focus on accountability and rehabilitation, not just retribution, and acknowledge genetic predispositions.

• Emerging technologies like embryo selection raise profound ethical questions about parental choice, societal values, and human diversity.

The discussion explores the genetic underpinnings of behaviors like risk-taking and antisocial tendencies, emphasizing that while genetics play a significant role, they do not dictate destiny and interact with environmental factors. Dr. Harden critiques the simplistic 'nature vs. nurture' debate, advocating for a nuanced understanding that informs more compassionate and effective societal responses to complex human behaviors, rather than purely retributive punishment. The conversation also delves into the ethical considerations of emerging genetic technologies like embryo selection.

Controversy of Past Work

• 00:00:04 Following her previous book, Dr. Harden experienced significant academic controversy, where some peers distorted her message, turning her into a 'villain.' In contrast, feedback from general readers was overwhelmingly positive, with many expressing how her work provided new understanding about their own lives, family differences, and decisions regarding parenthood, highlighting a stark contrast between academic and public reception.

Large-Scale Genetic Study

• 00:05:28 Dr. Harden was part of a large study involving DNA from 4 million people to identify genes associated with 'disinhibition,' a suite of seven behaviors including ADHD symptoms, early sexual activity, multiple sexual partners, cannabis use, problematic alcohol use, cigarette smoking, and self-described risk-taking. The study aimed to find genes common across these rule-violating behaviors, which often carry social judgment or consequences, and explore what other aspects of a person's life these genetic predispositions might predict.

Origins of Research Interest

• 00:09:28 Dr. Harden's interest in wrongdoing and impulsivity stems from a fundamental paradigm shift experienced during her first scientific job in a mouse lab, where she studied opiate addiction and withdrawal. Raised in a fundamentalist Christian household that viewed drug use solely in moral terms, discovering the biological and genetic underpinnings of addiction in mice challenged her prior beliefs and led her to pursue similar research in humans.

Evolutionary Roots of Behavior

• 00:12:17 Humans have largely self-domesticated over evolutionary history, exhibiting less aggression and more cooperation compared to genetic ancestors like chimpanzees, with physiological changes reflecting this shift. However, society also benefits from some level of risk-taking and deviance, as seen in the success of entrepreneurs who exhibited teenage delinquency, indicating a tension between pro-social self-regulation and the need for outliers to drive societal progress.

Heritability of Antisocial Behavior

• 00:31:03 Childhood antisocial behavior, particularly when accompanied by callous unemotional traits (childhood psychopathy), can be as highly heritable as schizophrenia, with estimates around 80%. This type of antisocial behavior is less responsive to environmental factors and current psychiatric treatments are largely ineffective for it, posing a significant challenge for parents and clinicians. In cases where antisocial behavior is largely a response to environmental trauma, heritability tends to be lower.

Free Will and Culpability

• 00:25:01 The concept of free will is less practically useful than understanding how genes and environment shape individuals, particularly when considering punishment and accountability. Dr. Harden emphasizes that individuals are profoundly shaped by factors beyond their control, blurring the lines of personal responsibility. She argues for distinguishing between accountability (enforcing rules and protecting society) and retribution (deliberately making someone suffer), suggesting that no one inherently deserves to suffer.

Retribution and Human Nature

• 01:27:03 Retribution is an evolved cooperation enforcement mechanism, with studies showing that even young children will pay to see a wrongdoer suffer, and brain scans indicate dopamine release (a reward signal) when people witness punishment of perceived defectors. This inherent human tendency to seek retribution, particularly when others are dehumanized, highlights a powerful and potentially dangerous instinct that society must learn to manage rather than indulge, as seen in the Norwegian justice system's approach to mass murderers.

Embryo Selection Ethics

• 02:13:47 Embryo selection presents complex ethical dilemmas, balancing reproductive autonomy and the potential to mitigate disease risk with societal impacts. While it offers clear benefits for families with prevalent genetic disorders, concerns arise regarding the accurate communication of genetic risk, the potential for a 'slippery slope' toward selecting for superficial traits, and how transforming a 'chance event' into a 'choice' might erode social solidarity and support for individuals with conditions perceived as avoidable.