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For the kinds of nuclear exchanges contemplated between the US and USSR by the 1960s — e.g., multi-megaton attacks with multiple warheads assigned to every target — it stops being very useful. Hence the move away from that and towards fallout shelters for those downwind.
But if we are talking about a single, submegaton detonation — then it could help. Putting numbers on how much it might help is hard to do. But I think as a public awareness campaign there is nothing better than embodiment of the threat. It drives it home.
Don’t look at the eclipse. Don’t eat Tide Pods. Do duck and cover.
Almost everyone I talk to is under the false impression that a N. Korean nuke would be nearly 100% fatal. Some even think nuclear winter. It's a very persistent myth left over from the cold war.
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