I don't think this makes much sense, due to the scale of the two parties: Iran somehow figuring out how to get a nuke onto a US city would invite complete and t

I don't think this makes much sense, due to the scale of the two parties: Iran somehow figuring out how to get a nuke onto a US city would invite complete and total annihilation of Iran -- and the world would largely support it. Iran knows this. Nukes among peers aren't there to be used. They are there to immobilize and freeze a layer of conflict.