I am not saying NK is wise. What I am saying is that our presence is not necessary. Chances are, NK would not have developed nukes without a US presence. Certainly, they would not have developed ballistic missiles. They would have had no need to do so since they can attack SK without them.
this is a problem for the KOREANS to work out. If we stay there, they will never be able to work it out. NK will always be blaming the US and SK will always be turning to us when they face a problem. We need to come home and let them work out their problems -- the world will be a better place for it.