Change the environment and the individual changes. We have a better understanding of biology and genetics. It appears that, at the very least, we have genes that influence impulsivity. Everyone here probably had an experience with a family growing up or as adults in which the parents were, the other children were fine, yet there was that one sibling unlike the others. Mean, violent, impulsive, miscreant type. That isn't environmental. What happens when females in particular groups in society procreate with large numbers of men with these traits? Well, we see what happens. Mix in the environment with absent fathers, the decay of institutions, like the church, attacks on the the police and the legitimacy of law enforcement, and you have the violent crime rates we have right now. We delude ourselves when we talk ourselves into believing that this is all environmental. It's naive and it's ignorant of biology and genetics. We have bad seeds. A lot of them. The most current research on child sociopaths is pretty depressing. Once they get past a young age, without serious intervention, the prospects are pretty dismal.