North­eastern Uni­ver­sity crim­i­nol­o­gist Jack Levin agrees envi­ron­mental influ­ences deter­mine whether a psy­chopath will go on to be vio­lent, but dis­credits Fallon’s theory

The author of a book about mass mur­derers, “Extreme Killing,” Levin said most serial killers are in their 30s and 40s.

You can deter­mine the bio­log­ical roots of psy­chopathy, including the lack of empathy and remorse and manip­u­la­tive dis­po­si­tion, but the problem is, that does not nec­es­sarily trans­late into vio­lent behavior,” he told ABC​News​.com. “There are lit­er­ally mil­lions of psychopaths.”

The Amer­ican Psy­cho­log­ical Asso­ci­a­tion claims that as many as 3 per­cent of all Amer­i­cans have anti­so­cial per­son­al­i­ties, according to Levin, “meaning they are crafty and shrewd and mas­ters at pre­sen­ta­tion of self.”

They might sell you a bad used car, or might be wom­an­izers or patho­log­ical liars or cheaters, but that doesn’t mean they will kill anyone,” he said. “Not unless you become an obstacle to their suc­cess — and then you better watch out.”

 

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