Yeah, I take your point on bin Laden. Religious nuts are a whole different bowl of fruit salad in the braincase.
Their problem is nott usually depravity, butt an inability to perceive reality without the framework of their inane religious beliefs. It's a cognition problem, IMO.
Psychopaths are often ruthlessly analytical and realistic. They know exactly what they are doing, and it is nott for a 'higher purpose'. They are motivated solely by self-gratification, which may include sadism. They do nott think that what they are doing is 'good' in any theory of the world/universe as religious terrorists usually do.
I think a psychopath does nott even consider the concepts of 'good' and 'evil' as having any real meaning. I know that I sure don't.