Well animated, but...
Well... Imagine that you are a North Korean. Suddenly the president of the strongest country in the world, armed with hundreds of nuclear weapons, says that your country is within the axis of evil. Then he attacks Iraq. Wouldn't you be scared that the next target could be your own country? Thousands of Iraqi people died in the war - so why shouldn't happen the same thing to North Korea?
I don't know if the North Koreans have really made those weapons, and I don't know how many they made, but it would definetly won't be enough to win against the U.S. If N.K. attacked the U.S., maybe the U.S. army would turn whole N.K. into hell. It's simply impossible that N.K. strikes first. That would be suicide.
Don't you understand? The few nuclear weapons N.K maybe has are just for defence! USA maybe are always the good guys in our eyes, but North Koreans would definetely not think so. Actually, I myself am not sure about that, either.
So before blaming NK for saying that they have nuclear weapons, we should blame ourselves for giving them no other choice.