"Always good to indulge in some rational thinking about disasters" ...

Where is the fun in that. LOL.

I get a good chuckle surfing the various "survivalist" forums. They are awash in improbable. Global nuclear war, millions dropping dead from a super-bug, zombies rising from the graves and the majority of the population deciding that common sense and civilization are not the way to go. Improbable events make for good stories.

The more probable events are natural events we know about, slow downturns in human events and localized man-made disasters. These don't make for good stories. In part because they don't lead to events which allow a comic book hero to function in the normal comic book ways. Blizzards and recession doesn't lend many opportunities for righteous and decisive gun-play and gratuitous violence.

Hunkering down, being reasonable and husbanding resources just doesn't have a heroic air. Of course what it lacks in heroic flare and it makes up in reality and effectiveness.

Which comes down to the simple question: Why are you into survival. Are you reality based and looking for practical solutions are you looking for some ego stroking posturing with an option for playing the hero.