Duck and cover didn't do a whole lot. All that was needed were a bunch of nukes and do as the Chinese now do: have a few loose cannons in government employment make statements about how they would react (or want others to think they will react). Of course that works better at the state-to-state level than when dealing with state-to-people or people-to-people conflict. The reasons for that are many -- and I could also go into a whole discussion about the "Hercules-team" approach -- but I'd rather not.