Maybe, that's too much TV... and one little thing, where does the most of those USA scientist come from?

Off course, there's no doubt that USA would win a direct war against North Korea, in the short term. But what would happen next, remember Iraq, Afghanistan and Libya, all of they governments were overcome by the USA military, and how are them now?. I mean, in all those country there are Muslim governments which are not so happy with USA presence, and in the long term that kind of USA interference will cause more and more negative feeling in that societies. Remember one thing, a strong military is not enough to maintain power (Remember Romans, Egyptians, Persians, Mongols...etc...) there is a need also of a strong society which support them, and if you see USA society, Christian Extremist, killing each other in schools and malls. I think it's just a matter of time for history to write down another falling empire...