He's a traumatized billionaire who dresses like a bat to pursue and attack people he doesn't know, who hides himself in a cave where he has lots of vehicles he uses to... destroy the city while pursuing criminals? If that's sane, please God to come down and see.
If the world was full of people addicted to cocaine and heroin and whatnot, wouldn't it be pretty terrible? I think society would be on the verge of self-destruction. Crime would be down, but accidents and deaths would be up
Batman has a problem with crime (that's, people who hurts and kills other people), so he would be fine in a society with much less crimes (supposedly, cause he is crazy)... Anyway, it's very very naif thinking a world where drugs are legalized would be a hell in the verge of apocalipsis