It's simply because the stocks of nuclear weapons are now so much smaller they can't bring nearly the end of the world. Plus, in 1960s many still lived under il

It's simply because the stocks of nuclear weapons are now so much smaller they can't bring nearly the end of the world. Plus, in 1960s many still lived under illusion that communism/dictatorship provided some viable alternative to evils of capitalism. Now it is too dead obvious they don't.