Antisocial behavior in children, especially when combined with 'callous unemotional traits' (a lack of guilt or remorse), can have a heritability estimate as high as 80%. This places its genetic influence on par with highly heritable disorders like schizophrenia and bipolar disorder.

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.

Despite decades of research, the core question of "nature versus nurture" in creating a psychopath remains the central unsolved mystery for FBI criminal profilers. While killer Israel Keyes had an abusive childhood, his nine siblings did not become killers, underscoring the complexity and leaving experts without a definitive answer.

Persistently antisocial children often have a biological inability to learn from negative consequences, making them punishment-insensitive but reward-sensitive. Harsh punishment is ineffective and counterproductive, as it destroys the potential for connection, which is the only real leverage for behavioral change.

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.

Attributing traits to either genetics or environment is a false dichotomy. As the genetic disorder PKU shows, outcomes depend on the *interaction* between the two. Believing a trait is purely "in our genes" wrongly dismisses the power of environmental interventions, which can completely alter outcomes.

Direct-to-consumer genetics companies often market DNA results as revealing "who you really are." This fosters genetic essentialism—the false idea that genes are destiny. This mindset is risky, as it can lead people to internalize genetic predispositions as unchangeable flaws or "bad seeds."

The onset of antisocial behavior before age 10 is one of the biggest predictors of a lifelong pattern of offending. Cold, callous aggression towards others or animals at this young age, often with a heavy genetic component, has a poor prognosis and currently has vanishingly few effective treatments.