Why can orphans get away with robbing the bank?
Because no one wants him.
Alright listen up, you dingus. So, orphans, right? They ain't got no parents. And get this, the joke is that nobody "wants" them. Get it? Like, they're unwanted. And since they got no parents, who's gonna claim them if they rob a bank? No one, that's who. You probably still don't get it, do you?