Batman's character would work much better if he actually succeeded in rehabilitating any of his villains
I dont really know how to structure this and my english isnt very good so i'll just keep it short.
By the way this is all outside of comics
Batman is delusional, batman stories make that no secret, its very front and center that his reasoning for not killing, thinking that every villain can be rehabilitated, is delusional and doesnt work. But this belief would make infinitely more sense for him to have and be less tiring to watch him cling to if he actually rehabilitated atleast one of his villains but in most stories he doesnt, not even someone like 2face who is still in touch with reality and not completely hopeless. Again, we are supposed to see his belief is childish and unrealistic but it would be so much more entertaining and logical if he actually did it atleast once.
Also catwoman and mr freeze dont count because they arent truly evil