My brother was diagnosed professionally as a sociopath at age 13 in 1969.
Back in the day most people would think of a psychopath as violent. And yes, they could kill you. But most don’t. They don’t want to go to jail. Even if they would have no remorse killing someone. They are often far too cleaver. Being a psychopath does not mean you are criminal or violent, just that you don’t care if others live or die or are harmed. You care about yourself only.
That was him to a tee. And he was violent if he did not get his way.
He could be as nice a person as you would ever know, as long as you did not cross him or get in his way....................