Ur right and your wrong IMO, most normal nations like USA, India, France, Russia, and other nuclear powers (does India have a bomb yet?) will play nice cuz they have nothing to gain, but others like IRAN, possibly future Iraq, N Korea, and others aren't so nice or reasonable.
Just imagine if you will that in a year NYC is hit with a nuke, where from? who knows (not missile), then how friendly do you think that we will be with Russia and every one else? The scariest thought is if someone were to hit the US and then hit some one else to make it look like retaliation, then u can guess what kind of mass chaos would ensue.