<Snipped quote by The Grey Warden>How?
Nukes aren't some autohitting weapons that cause gameover.
There are countless ways to intercept them, especially in this age where we have better computers, faster targeting systems, better sensors, railguns and even DEWs.
Even right now we have methods to track and shoot down targets less than 10cm in diameter over much smaller ranges.
Yet you think we can't do the same with a 10+ meters long ICBM coming from tens of thousands of kilometers away (given its parabolic route)?
I may suggest you to read up on this subject because your fear is entirely unfounded.
I know how much hate can drive a person to do some unthinkable things. I saw one person declaring war on another just because of an argument. It happens often. I take it that you haven't roleplay that long to see that or you have just been lucky enough.