What mental illnesses do Batman's villains have?

In truth it is hard to tell what is wrong with them because we don't even know what kind of mental illnesses people have. There is still a lot to learn. The joker is a anonomally. Apprently he is fully sane even saner than batman. Mentally there is nothing wrong with him so the fact that he is so evil and cruel is weird. read more

"Batman villains, both serial murderers and non-serial murderers alike, are frequently referred to as 'insane' in the comics, but insanity is actually not a psychiatric or mental health term, but a legal concept," he said. read more