As a culture we are obsessed with psychopaths, but in reality there is nothing out of the ordinary about people who enjoy sadistically wielding power over others. You find them in every schoolyard. The difference between a psychopath and a bully is that bullies act in a way that increases their power and standing, so they are affected by (and can be constrained by) social and cultural norms, especially among adults. Our obsession with psychopaths (and the power fantasy it reflects) reinforces bullies' intuition that people secretly admire and envy their bad behavior.