It can seem pretty cute when little Bobby is wrenching the heads off his sister’s Barbie dolls, but some of his adorably morbid actions may foreshadow a dark and bloody future. Over the past few decades, psychologists and criminologists have closely studied what it is that makes a killer into a killer. Are killers born with some sort of homicidal gene? Is it drug-related? Childhood trauma? Too many horror movies? A combination of multiple factors can be the problem, and to this day no one can pinpoint the exact concoction of circumstances that influence a child to grow up into a cold-blooded murderer. [Read more…]