@filthythebear: Being in a wheelchair isn't a cause. Oracle isn't a cause. He rarely brings up what happened in the Killing Joke anymore. She just happens to be in a wheelchair. All you're doing is trying to bring in psychology to cover up your ignorance. Relatability is going through the same thing as someone else. People can relate to not having parents like Batman.
But hey since you want to bring in psychology, the Hulk has multiple personality disorder. Don't know anyone who reads comics, relating to that.