tl;dr is shorthand for Too Long, Didn't Read, which so often happens on these sites.

What it comes down to is that the more we push the N. Koreans, the more we feed Kim's paranoia.  The less we push, the more he seems to subside.  Kim learned the lessons we taught in Iraq, had Iraq actually had nukes, we wouldn't have invaded in 2010, he has nukes, so there is no more military option on the table.  Or more to the point, there isn't a rational one.  We attack him, we get to see either a nuke go off in say, Seoul, with millions of dead, or one comes to the US on a freighter and we see a minimum of thousands of dead in one of our port cities.  

This fantasy that we can take him out quickly is just that a fantasy, we tried that in Iraq and we are still fighting there.  You honestly think we will do a better job in Korea?