Psychopaths cannot be understood in terms of antisocial rearing or development.
They are simply morally depraved individuals who represent the "monsters" in our society.
They are unstoppable and untreatable predators whose violence is planned, purposeful and emotionless. The violence continues until it reaches a plateau at age 50 or so, then tapers off.
Their emotionlessness reflects a detached, fearless, and possibly dissociated state, revealing a low-state autonomic nervous system and lack of anxiety. It's difficult to say what motivates them - control and dominance possibly - since their life history will usually show no long-standing bonds with others nor much rhyme to their reason (other than the planning of violence).
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