Obviously, if it wasn't him flying that mission, it would have been someone else; having said that, and regardless of whether or not you agree with what took place, there's no question that his actions that day saved what experts estimate is 1,000,000 Allied casualties, as well as countless more Japanese who would have died pointlessly had we had to invade. That war had already gone on too long.
So, Paul Tibbets, thank you, and may you rest in peace.