Japan says it may launch a preemptive strike against North Korea if it feels sufficiently threatened. The Japanese, of course, have done this sort of thing before (and, it should be noted, they have a firm grasp of the risks involved). Is it wise or moral of them to launch such an attack? That will depend on the circumstances. But it's good to see someone else acting like adults and recognizing that there could be situations where a preemptive attack could be necessary.