Kim is seen as God in North Korea, they worship him. Remember they have no exposure at all to the outside world and the Kim family is their religion, all the books and programs elevate his greatness and magnificence. They will fight to the last man for him. Plus, they have not forgotten that we killed 20% of their population during the Korean War and they absolutely hate us. A war with them is not going to fix anything, we have to be really smart here.