Come! Enter into the safe haven beneath the seas! Where humanity fled from the deadly Kalleum bombs! Take Refuge Beneath the Waves.
You think the zombies are bad? Wait till you meet their masters!
There is a group that believes no good can come of trying to change to future to render a prophecy or prediction incorrect. They believe that meddling will either cause the prediction to be true in the first place, or make something worse or more extreme happen.