People want to believe in the end game disaster -- it justifies their basic belief.
But seriously, surviving in a zombie like existence has very limited appeal.

I still remember the air raid drills in the 1960's at school. We huddled in the school's basement under the asbestos wrapped heating ducts practicing for the Soviet nuclear attack that never came -- in the end, wasted effort for the event that would destroy our world as we knew it -- mental masturbation.