“The real answer to questions like, ‘Why doesn’t the Flash clean up Gotham City, too?’ is ‘It would make Batman’s cake lousy. People read Batman because they like crimefighter stuff where Batman’s cool, and don’t really want to see Superman or the Flash or Green Lantern mess with that particular cake.’ On the other hand, people who like stories where Batman and Superman and Green Lantern work together have the JLA cake, and some people like both kinds of cake.
But if you start to tie it together with logic foremost in your plans rather than entertainment, then you need to explain why Superman doesn’t help all the other heroes almost all the time, and why aren’t the crimefighters turned into SF-type heroes to make them more effective, and you end up with everything being JLA cake, and no solo Batman cake left. Or you come to the conclusion that it doesn’t work, so Batman shouldn’t be in the JLA, which maybe preserves the Batman cake, but it messes up the JLA cake.
So in the end, the answer to all of these questions is: Don’t mess with my cake.”
— Kurt Busiek, using a cake/frosting metaphor to point out how logic should never trump fun in shared-universe superhero comics. He’s right of course, and that he even has to point this out goes to show how grown-ups ruin everything.
(via The Comics Reporter)