If they cannot get their delivery system off the ground, they are impotent. Sure, they are dangerous IF they are allowed to act out. But, like any other spoiled children, they would be smacked down by the neighbors, if they did not have the protection of their parents (China in this case). Even S.Korea could squash them if they wished. S. Korea does not want the expense of N.Korea's welfare. Remember how hard it has been on Germany when the wall came down. Economics of the additional welfare is crippling.