Why prepare at all? If there were to be an Armageddon scenario, the chances of surviving it, prepare or not, is minimal. Even if you did prepare and happen to survive, you wouldn't survive for very long.
"The world is going to end and everyone is going to die, but I will survive because I [Insert dumbass reason here]." Derp.
It's like the whole "survive the zombie infestation" thing. A disease that infectious would have everyone dead in a few years, no matter how many zombies you can kill with a chainsaw.