The return of the spectre of nuclear war?
Glen Reynolds collects a number of links here.
"It's more survivable than most people think."
Well, yeah. Anybody who actually studied civil defense back during the Cold War knew that, but the "Enlightened" required a doomsday scenario to feed their anti-war agenda. America's civil defense infrastructure rotted away, although I got a nice set of surplus radiation detectors out of that deal.
And as others have pointed out, there are a lot of more likely disasters where the same preparations you would make for a terrorist nuclear attack would also come in handy.