Not that what he says is wrong
But far more important, is the fact that practical U.S. hegemony does not include N.K.
China borders N.K. Japan and Russia are nearby neighbors. They should at least be given the opportunity to take the point here. In addition to this, while I have no doubt that N.K. might collude with Islamic fundamentalists, it is not right in the middle of the boiling pot, as is Iraq.
Bottom line, two different situations. We certainly shouldn't be expected to immediately apply the same solution to every problem.