I think people like the zombie apocalypse because zombies are easy. They're stupid, slow, and incapable of using anything above simple tools at best. No matter what you do to a zombie, it's a monster, so it's sort of justified - hell, they're dead, so they can't even hurt. So zombies are a good outlet for sociopathic fantasy. Anyone who isn't brain damaged and at least moderately physically capable can outwit and outfight a zombie.
Now if it was a bearpocalypse, we'd all be screwed.