Have I Watched Too Many Movies?

I have come to the conclusion that there must be an alien attack coming our way. Or maybe a huge-ass asteroid is gonna wipe us out. Because why else would anybody need thousands of nuclear devices?

An actual nuclear war is not winnable - everybody loses and everybody has known that for a while (M.A.D.) so there won't be one. So the only reason you might need one is to destroy the occasional nut-job with a death wish.

So why bother with the huge arsenals? Aliens, that's why.