It's not anyone's fault. A social transition.

It continues. It began with abandoning the soul. Without magic, what is a man but genetics and experience? If everything a person is is a product of chance, what does responsibility mean?

That Wild Streak? Maybe It Runs in the Family - New York Times

... A growing understanding of human genetics is prompting fresh consideration of how much control people have over who they are and how they act. The recent discoveries include genes that seem to influence whether an individual is fat, has a gift for dance or will be addicted to cigarettes. Pronouncements about the power of genes seem to be in the news almost daily, and are changing the way some Americans feel about themselves, their flaws and their talents, as well as the decisions they make.

For some people, the idea that they may not be entirely at fault for some of their less desirable qualities is liberating, conferring a scientifically backed reprieve from guilt and self-doubt...

We're slouching towards wisdom. Eventually, after much back and forth, if humanity survives, we will have a very different understanding of responsibility and punishment. An understanding which most of humanity today would consider bizarre, even repulsive. I bet 40 years.