Batman: The Dark Knight Returns
by Frank Miller
Throughout Dark Knight Returns, there's a running argument about whether Batman does more good or evil for society. Miller takes pains to make the characters espousing both sides of the argument look like idiots, letting them voice closed-minded or naive thoughts in the same breaths with which they render their opinions on Batman. But he also makes sure that both sides have a point. Obviously Batman stops a lot of crime and criminals, but he also inspires the Joker to come out of retirement and kill hundreds. Commissioner Gordon (and ultimately his successor) ultimately feels it best to look the other way, but it's a murky decision.
I have same complaint about Miller's Batman that I do about the Christopher Nolan movies: when he's causing destruction at a massive scale, it's ridiculous to continually point out that he doesn't kill people. He kills bunches of people.