Often it’s to give some demagogue who doesn’t have power and money YET… power and money. Who then rearranges the deck chairs to stay in power until the next existential threat can be manufactured in the public mind.
I suspect it’s because in the film, Alex has a pet snake, which wasn’t in the book. And everyone knows snakes = porn. For additional positive correlations, see “Blade Runner.”
I recall growing up in a small town where a number of neighbors had bomb shelters. The likelihood of a bomb being dropped anywhere other than a large city or DC was tiny, of course, but…
And I still remember the “duck and cover” song. Also “educational” film strips.
They could save time by not putting a bottom on the box and instead install it over a circular file.