https://news.un.org/en/story/2022/08/1123752
Such a big world changing decision is only made by a very small percentage of the population.
https://www.bbc.com/news/world-62381425
The problem is that any average person has no effective choice to stop the use of such weapons.
https://www.euronews.com/2022/08/02/world-one-step-from-nuclear-annihilation-says-un-chief
Therefore, if any cities or nations are destroyed, it's from a much higher level of people. Not just the military, but an overall power structure.
So if the entire world or even just part of it is destroyed, it is as a result of the power structure wanting to take that course of action.
DEVO - Beautiful World https://www.youtube.com/watch?v=56u6g0POvo0 , https://www.youtube.com/c/DEVOvision/videos
Even if there is never quite a global nuclear war, some people think that there should be a lot more nuclear+power plants constructed. That way even more toxic waste can be created. The problem is, that most people wouldn't benefit from more nuclear waste, any more than from a global nuclear war.