One of the things we knew during the cold war was that nuclear war would be the ruin of society. It was rightly feared. Keeping the peace between the two nuclear powers wasn't seen as a sign of weakness, everyone realized the alternative. Aside from the immediate millions of deaths, the longer term (ie after the first day) effects would be capital C Catastrophic, even if the threat of nuclear winter was overstated.
I read this as: oh it wouldn't be so bad. We could probably shoot many of them; and many won't make it, probably. This is incredibly optimistic; Russia has started modernization of its nuclear arsenal long before us because it has a stronger reliance on nuclear deterrence in defensive capability than we do.
At the time of writing this, this is also the top voted comment. Simply terrifying. Every day I have the fear we're going to head straight into the new Cuban missile crisis and one that we may not be so lucky to escape.