All of forensic criminal psychology is haunted by one question: Are psychopaths born or made? The debate is as old as Socrates, who believed that human beings were incapable of deliberate evil. Wrongdoing was born of ignorance or delusion. “There is only one good, knowledge,” he said, “and one evil, ignorance.” Two thousand years later, we know little more than this: Evildoers have forever been among us. But why? What makes them so?
