Originally Posted by Lead Cenobite
I don't know if he qualifies as a psychopath, but Superman's arch nemesis is a powerless human: Lex Luthor.
Lex Luthor isn't a psychopath criminal, but a powerful billionaire genius who has even been the president of USA, and this IS a threat for Superman (I think the only human threat he has ever had). Nothing to see with the Joker or the rest of regular cast of Batman's villains.
I think if Superman represents God Lex Luthor is the rebellion of the human race against it, and if Batman represents the human order the Joker is the rebellion of the human individual against it. Curiously both Lex Luthor and Bruce Wayne are millionaires, but the first is considered a villain and the second a hero