I think Sam Harris is wrong and here’s why. I read a story recently about a neuroscientist who had on his desk the brain scans of people who had been, or currently were, in prison for murder. To his shock he discovered that he had mixed his own scan in with those of the murderers. His brain lit up just like that of a psychopath but he had never killed anyone. His family said that they always thought of him as somewhat cold and distant, maybe even manipulative, but he had never killed anyone. So it seems that it is a perfect storm of nature and nurture that turns someone violent.