People interpret genetic causes in two ways: determinism (my genes made me do it) which can be mitigating, or essentialism (my genes are my true self). When people view genes as the 'essence' of a person, a genetic link to bad behavior implies the person is inherently and unchangeably bad, increasing blame rather than sympathy.

Counterintuitively, jurors recommend longer prison sentences when a violent crime is attributed to genetic causes versus environmental ones like childhood abuse. While environmental factors are seen as mitigating, genetic explanations trigger a 'bad seed' essentialism, leading to a greater desire for punishment to contain a perceived permanent threat.

The consistent pattern of men committing mass violence is rooted in biological evolution. Men are wired for aggression and physical confrontation, a trait historically selected for by women seeking protectors. This is a biological reality, not a surprising social anomaly.

Humans experience pleasure, mediated by dopamine, when witnessing someone perceived as a wrongdoer being punished. This suggests retribution is not just a cultural construct but a deeply ingrained, evolutionarily adaptive mechanism to enforce cooperation within a group, making it feel intrinsically rewarding.

People often frame a person's situation as a "choice" to justify punishment or unsympathetic treatment. This linguistic move shifts blame onto the individual, providing a moral license to enact punishment. This pattern is prevalent in contexts ranging from airline policies to broader political discourse.

In cases of extreme violence, we seldom investigate underlying biological factors unless there's an obvious "smoking gun" like a brain tumor. The discovery of a rare MAOA gene mutation causing extreme aggression in a Dutch family raises the question of how often people are labeled as "evil" without any search for an organic cause.

The idea that we have free will, even if 'literally false' from a determinist perspective, is 'functionally true.' Acting as if you have agency prevents outsourcing responsibility and leads to a better life, making it a useful cognitive tool regardless of its philosophical accuracy.

Genes linked to addiction, impulsivity, and aggression are most active during fetal development, affecting the brain's fundamental balance of inhibition and excitation. This reframes addiction and conduct disorders as neurodevelopmental conditions akin to ADHD, rather than purely as choices or moral failings.

Challenging the binary view of free will, a new mathematical model could show that individual agents (us) and the larger conscious systems they form can both possess genuine free will simultaneously, operating at different but interconnected scales.