[xoxoxoBruce]

The North Koreans are more interested in food than insurgency. Most of them would probably head south at the first opportunity.

And no, they don't have "The Bomb". They managed to set off one crude explosion of questionably nuclear material.

tw's perspective is not from a military position, but of civilian scholars that study military moves and their results. You know, the people that planned Afghanistan and Iraq.
Attacking North Korea would be another example of their expertise, in telling the military how to wage war... ie, fiasco.