I agree Patti that is a brilliant example. It hits the nail right on the head.It is the ability to emote which is so crucial. To be able to stare your father in the face and shoot him and batter him in cold blood, never mind the rest of the story.
One has to be a psychopath to have committed those murders Maggie. Someone who was pushed to the limit and snapped. Son or daughter....to have looked into the face of their parents and shot them to death....then shot two 6 year old boys.....not once, but several times.
I've just been watching some more clips about psychopathy and, scientists have come up with some amazing stuff regarding brain images and the brain functions. In 10 years time, a psychopath could treated with a micro chip inserted into the brain, so that the brain functions like a normal person.....WOW!