NYTimes              [...] If you aren't sure whether you are a psychopath, Ronson can       help. He lists all the items on the standard diagnostic checklist,       developed by the psychologist Robert Hare. You can score yourself       on traits like "glibness/superficial charm," "lack of remorse or       guilt," "promiscuous sexual behavior" and 17 other traits. As one       psychologist tells Ronson, if you are bothered at the thought of       scoring high, then don't worry. You're not a psychopath.        
       One of the traits on the checklist is "callous/lack of empathy."       This is the focus of another new book, The Science of Evil: On       Empathy and the Origins of Cruelty (Basic Books, $25.99), by Simon       Baron-Cohen, a Cambridge psychologist best known for his research       on autism. Baron-Cohen begins by telling how, at the age of 7, he       learned that the Nazis turned Jews into lampshades and bars of       soap, and he goes on to provide other examples of human savagery.       To explain such atrocities, he offers an ambitious theory grounded       in the concept of empathy, which he defines as "our ability to       identify what someone else is thinking or feeling and to respond       to their thoughts and feelings with an appropriate emotion." For       Baron-Cohen, evil is nothing more than "empathy erosion." [....]       
       I think there's a better approach, one that involves breaking       empathy into two parts, understanding and feeling, as Baron-Cohen       himself does elsewhere in his book. Individuals with autism are       unable to understand the mental lives of other people.       Psychopaths, by contrast, get into others' heads just fine; they       are seducers, manipulators, con men . . . and often worse. (Ronson       tells how one psychopath — "good-looking, neatly dressed," with "a       bit of a twinkle in his eye" — encountered a troubled teenager and       decided to provoke the kid into attacking his family with a       baseball bat, killing one person.) The problem with psychopaths       lies in their lack of compassion, their willingness to destroy       lives out of self-interest, malice or even boredom. [....]