You know too much about crazy kava, did you really bring out DSM. So you think the joker has an anti social personality disorder, maybe PTSD from the wounds in his face. To Bruce Wayne the killing of his parents seemed crazy and unpredictable, so his pain is what manifested the joker, bane should be in the pantheon of great supervillains,actually dark knight rises was better than dark knight, in my opinion.
Darth Vader cant be in there he had a change of heart,same with venom,magneto,dr doom, in some way they were conflicted villains, even apocalypse in the movie.Bane was intelligent and multi dimensional.Thano is an intergalactic warlord,also conflicted, but maybe that's what makes a great supervillain, when you are faced with a defining choice