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Take the examples I cited earlier (pandemic, civil unrest, invasion) that would make me flee my home in the first place, and then multiply them so that any civilized location would pose significant risk(global pandemic, world collapse, world war, apocolypse),

Is this what we are "prepared" for on this forum? Is this what the OP (mntlvr) had in mind when this thread was started? If we are facing the apocalypse then I doubt the mentioned "evacuation center" would be in business. During the past world wars and global pandemics people, in general, did not head for the hills; and those that did were not really better off than those who stayed in town near a hospital.