Bad things haven't happened, that's just the point, chance has saved us up to now. We should have learned from those near misses and at least reduced arsenals down to a bare minimum( total elimination would  be impractical, and actually unnecessary ) and done other things like enshrine "no first use",  remove warheads from missiles, and a few others, things that would buy time that currently doesn't exist. 
You seem a bit fixated on N. Korea, yet are ok with the larger status quo. Why? And then you setup a strawman scenario where N. Korea commits suicide( nobody is going to just "ignore it") by taking out Hawaii or Seattle. Why is one insanity bad, while the vastly greater insanity is ok? It doesn't compute for me, not at all.