The US should obliterate N. Korea.

Rather, they're used as a threat (I forget the actual word ), right? --- The question is, what happens when N. Korea, who have all these bombs, and ordered by their crazy leader, to start a war with America because they've been itching for it for so long? What would the best course of action be - pre-emptive, such as was the excuse with Iraq, or retialitive (look ma, I made a new word!), attacking only when Alaska has been decimated? Is it right to kill a few thousand to save 320 million?

Do you mean deterrence?

One reason for having nukes is to deter adversaries from using that and sort of having a sense of security and defense. Even for North Korea and Iran, one reason why they desire for nuclear power is that they want to be safe from US and Israel.

I still believe in diplomacy concerning this.

As for the question, is it right to kill a few thousands to save 320 millions, I think it is not really the right way to look at it. Also, you question is really, is it right to kill a few thousands innocent because there are some reasons believe that they would cause harm to millions..