The problem is the range on radiation. Even though I don't live in a big city, I am close enough that if the nearest big city to me is nuked, I will probably get
1st degree burns and die of cancer in 20-30 years (according to nuke calculator apps I used).
But... there are actually more than 1 big cities surrounding me that would have that result, if all of them are nuked I would get repeat dosages.
One has to seek a pretty remote location.
... alternatively, I could get a house in a basement and live there. in that case I would be absolutely perfectly fine if the cities get nuked
while I am in the basement.
or I could theoretically find a sufficiently remote farmhouse where I would be perfectly safe.
also if enough nukes hit nuclear winter will fuck us over too. Can't exactly grow food in nuclear winter.
As lovely as it would be to excise the cancerous tumors that the cities become, WW3 with nukes is not the way to do it.