The funny thing about comic book stories is that the usual roles of protagonists and antagonists are reversed: the villains are the ones who are proactive, trying to achieve something new (even if it is something awful), while the heroes are only concerned with stopping them. That's why people love a good villain - aside from being generally more fun to watch than the goody-two-shoes superheroes, they're also the ones who drive the story forward. It's also why games like Dungeon Keeper and Infamous are so popular: it's just more fun to be the bad guy.
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