I fear that with missile defense and impending climate disruption models, the calculus of MAD may have been updated somewhat: no-one wants a starving population with a MAGA-level of understanding and education about their predicament roaming around the enclaves...
If you thought California's and Australia's fires were what climate impacts will look like, think again: a limited nuclear exchange will probably have about the same disruptive impact as a bad climate year in 2035 +/- 10 years. Tidsfrist!
A bad climate year will kill a handful of people, like California and Australia's fires did. (Humanity is getting richer and more capable faster than the climate is getting warmer.)
A limited nuclear exchange will likely kill millions of people.
A bad climate year in 2040 will kill millions of people. Mark my words. Climate disruption is only getting started we are on an exponential response function between average temp and effects with plenty of hysteresis to come ie. no way back, won't regrow, won't feed...