Ah well
In any case, I still think the geography would make some kind of boost phase interception practical, with old-fashioned missiles, or maybe a railgun.
At the moment we have to be careful that we wouldn't be shooting down a test flight, rather than an attack. But at some point we, or the UN, could declare a "no launch zone" over North Korea, and just automatically shoot down anything with a reasonable infrared and trajectory signature, and say eff-em.
Back to the main issue: Relax a little, Robert. The odds of Trump actually burning down the country, or the world, are pretty slim, if not completely zero. But I can live with asymptotic. I have to, considering Kim Jong Un has drawn a bullseye on my head.