So, since someone's left visual field connects to his right brain, standing to the left helps you speak more directly to his nonjudgmental right brain and bypass his left brain's critical faculty. We all have high, low or average values for the temperament variables, each of which corresponds to a different personality trait. Combined, they yield different behavioral tendencies. Someone high in novelty seeking and low in harm avoidance, for example, will have a marked risk of self-destructive behavior such as alcohol abuse. It wasn't that Adolf Hitler had bad temperament, he had bad character.
Nobody is born evil.