I think you can do a thought experiment without violating the rules of this forum. It won't get into politics, and it focuses on survival, the central topic of the forum.

So it sounds like you're imagining nuclear attacks by non-state actors on major US cities, disrupting the distribution of food, fuel, etc. It sounds like you're not imagining being in a battle zone or in an enemy-occupied territory. Do you imagine your town to be close enough to one of the attack sites that you will have to worry about radiation and refugees? Are you assuming the collapse of government and the breakdown of order, or just an overburdened government with reduced social services, but the local cops are still keeping the peace? How long do you imagine this situation to last?

I think once we have a picture, it's easier to figure out the prep. Otherwise one could easily just get more and more anxious about future possibilities without coming up with anything concrete to improve one's own chances.