Evil People Share A Dark Factor, According To Scientists

Have you ever wondered what evil is and what makes a person evil? There are definitely examples throughout history of people who are widely considered evil. The usual suspects are Adolph Hitler, Charles Manson, whomever Jack The Ripper was, and you can even throw in Joseph Stalin in there. But is there something these dudes have in common that makes them do atrocious acts? Is it a childhood incident, brain damage, the need to be constantly loved, mother issues, or being possessed by a demon that gets them to do evil things? According to scientists, there are actually common traits or a "dark factor" that evil people share. These traits are actually behaviors we know of and we might even know people who have them.