The people of the DPRK don't think like us at all.  Totally different logic.  Try as we might to see the world the way they do we would have to have grown up there with the poverty and cult brain washing that takes place from the day you are born.  The unpredictability makes the situation highly volatile.  It is someone pointing a gun at you with you saying you better do as I say "or else" but your gun is holstered.