I guess I see what you're saying. Personally, however, with the Hulk, nobody dying is ********.
As for Batman Begins and The Dark Knight, I think they actually made "a man dressed up as a bat fighting crime" plausible. Then again, I think that kind of a thing is perspective.
Personally, I like the idea of superheroes as symbols and ideas embodied, symbols to inspire fear in evildoers, hope in the distressed, patriotism to one's countrymen, and so on, with the costume being a uniform of that symbol. It's a lot more mature and meaningful than just a costume worn because the hero in question wants to wear a costume.