Well, that's what the Joker said to Batman and Commissioner Gordon in The Killing Joke, essentially, and he was wrong. Heck, Batman is the result of one bad day, but he turned that bad day into an incentive to do good, not just an excuse to destroy.
No offense, but a parent outliving his or her son (and spouse) is worse than the tragedy of losing your parents, with both being unspeakably horrible. Especially then when you see the violence of it all.