It never fails to amuse when Australians ask me why on earth anyone would bother to build a bomb shelter in Australia.
They don't even know what they don't know. If they knew that then at least they'd know something but since they don't even know what they don't know it's worse than knowing nothing at all. They are sure that if they have a consensus that must mean it's true. That was probably a fairly reliable strategy for survival in 40,000 B.C. but it's a tad dated now.