Reposted -
Call it Psychopathy or Sociopathy or just "bad people," people with an excess of predatorial instincts are all around us. Overwhelmingly most are non-violent, but what Dr X points out is that psychopathy is a matter of degree.
Most people who worry about being bad or evil, are not especially so. Sociopathic people rarely recognize their inner bad, and often think highly of themselves. Significant degrees of sociopathy can be found in people in all walks of life, not just in penitentiaries (in which few penitents are to be found). I knew a brilliant, charismatic Psychologist with abundant psychopathic traits who probably helped more people than I ever will with his charm, warmth, and wisdom. He had enough self-awareness to keep himself out of serious trouble but he had some close calls.
Dr X pointed out this piece at Smithsonian: The Pros to Being a Psychopath - In a new book, Oxford research psychologist Kevin Dutton argues that psychopaths are poised to perform well under pressure. Not sure I agree, but an interesting topic.