I could, but what's the point. Nobody will live to talk about it. There goes my notoriety.
Besides, it's not as though the end of the world is the only time I can do certain things and get away with it.
Well, I could go on a killing spree, but killing really only interests me when I know there's a possibility of capture. It's the 'seeing what I can get away with' part that excites me, and of course, the potential for notoriety. The world ending takes all that away and murder no longer becomes interesting. So, I may as well sleep through it.