Yes it’s just an emergent state of two or more actors doing the somewhat sensible thing (not wanting their own people to be annihilated). The question is still

Yes it’s just an emergent state of two or more actors doing the somewhat sensible thing (not wanting their own people to be annihilated). The question is still why this wouldn’t work, since it did work (albeit very riskily) through the entire Cold War. AFAICT no relevant variable has changed.