I've known people that are profoundly evil, but most people go along with it because they have a fear. People have this denial about evil people because they are so afraid of crossing them. The evil person doesn't have to appear evil. You just know not to disagree with them.
Some people are just pure evil. They are highly successful, intelligent, manipulative, energy vampires. And you can't beat them. They just go from one victim to the next unrestrained. They are faultless before god.