3-NK is always positioning for more world attention. Remember a while back during negotiations with Bush, saying that they would "Bathe the west in fire?" Funny, I don't FEEL hot.
4-There are massive movement for democracy in Iran now. Get your facts straight.
5-Pakistan already has a massive US presence, and isn't in much danger to fall into civil war.
6-Too many countries have nukes? I believe there are 5 or 6 (US, Russia, China, India, Pakistan, some others in the west). In areas where nuclear programs have fallen apart (South Africa and Russia), international groups have ensured that nuclear weapons are either secured or destroyed. Contrary to popular belief, there are no loose nukes floating around.
7-Nuclear armed terrorist =/= nuclear war. Or detonation of bombs in America, for that matter. It would be pretty damn tough to smuggle a nuke into the US, especially considering someone would notice a missing nuke in advance.