1- GW Bush goes "General Ripper" on us and strike North Korea first - and whatever the hell he wants to bomb as well, the highest the number of megadeaths on the first night, the better.
2- The United States waits until North Korea attacks Japan - which is as close as they can get so far. So we'll have millions of Japanese and Korean civillians dead.
And on BOTH alternatives, you'll have a nuclear winter than will vanish humankind from the Earth - which is a good thing, if you think about it.
So PLEASE, again, anyone, give me a good reason for keeping nuclear weapons. Without using the words "just shut up" or "liberal commie bastard".