Long read, but a very interesting topic. Thinking back, most of the bullies from school continued aggressive behavior into young adulthood. One guy ended up getting his elbow broke by an ex-Marine on his 21st birthday (the Marine just grabbed his arm and kicked it once, but there were bones sticking out and blood everywhere) . During his recovery, he decided to change his life. He went about apologizing to the people he had tormented, went back to school and became a physical therapist. Just saying people can change, but I doubt if everybody has the same motivation.

I dunno, sounds too close to phrenology and eugenics to me. Want to make a kid go bad? Tell him/her they’ll go bad.

Better yet, be bad yourself. Works remarkably well.