I thought this was good sort of intro/overview:
He had an interesting analogy about psychopathy being on a spectrum, personalities having different shades and colors. Your personality is blue, but is it dark or light blue? If you are a psychopath and a serial killer maybe you are dark blue, and back up to a lighter blue you would have the same traits but not as strong.
"Psychopaths are people too."
"Yes, they are."
The comments for the video are pretty entertaining too: "you also have to account for external programming, extensive trauma in childhood and possession. most of the psychopathic killers are actually specifically programmed and possessed by reptilian or demonic entities. Heal those things and they would be quite different."