Evil in theory and incompetence in practice.
Speaking of which, here's an interesting addon to this dilemma: if you could prevent the destruction of the world by committing suicide, would you do it? Before anybody asks, yes, you CAN live out those twenty years, but the closer you get to the Big Day, the more likely it is you'll get things done too late and the world will still end up destroyed. What would you do?
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Twostuck, Homestuck RPG: http://www.gamefaqs.com/boards/8-gamefaqs-contests/62168402