having the planet and consequently humanity devastated

We don't need nuclear war for that, we're already well on our way there just by continuing to use fossil fuels and raping the earth and demonizing any kind of environmental / climate protections. Conventional war is a huge contributor to emissions, and political instability also doesn't need nuclear war to affect you negatively.

Does that help? On one hand, everything is going to shit already even without nukes flying. On the other hand maybe it helps if the things you fear are not that one huge spectre of nuclear hellfire that seems impossible to prevent for an individual, but many smaller things where normal people can make a difference through their actions.