True, there have been far too many Neville Chamberlains in western politics (Carter and Obama being classic examples) and  because of Chamberlain and his spineless , hand wringing supporters, Churchill didn't have what he needed in terms of equipment or people when Hitler came knocking. Rightly or wrongly, Trump is now in the same boat with North Korea as long as Seoul is within NK artillery range and Japan is just a cheap rocket trajectory away. Trump should therefore at least be smart enough to shut up and not make a problem he can't currently solve even bigger, however the situation came to be what it is. The North Koreans have worked diligently to be an entrenched, difficult adversary and the West needs to buckle down for a few years to make up for the weak leadership on this issue that you have correctly pointed out. Regardless, Trump yapping like a school yard punk on the evening news just isn't smart politics and won't improve behavior in Pyongyang.