Fred99:joker97: Surely KJU is 120% bad on the badness scale.Or perhaps you mean he is not a bad person, just categorically insane.
I suspect it's all show/bravado, intent on keeping his subjects and millions of soldiers etc loyal - to believe they can win. Not much fun being in the army if you're on the side that's going to be wiped out, which is exactly what will happen if there's conflict. Eventually that is - as they surely could unleash hell on (at least) South Korea in very short order.
It is a very effective strategy. That is exactly why there have been no American strikes on North Korea. Like it or not, it is exactly the same as the cold war strategy used by the great powers.