Mr. Trump is turning up the heat. It could solve itself. If no American lives are spent will it reassure us in 2020?
No it won’t! South Korea will be hit if we attack, and Trump will be blamed for those casualties/deaths, and the media will make it all his fault! And what if there are any US lives spent? It’s a no win situation either way! So let him blow up his mountains and spend his missles!
If we attack North Korea, it doesn’t ensure a 2020 win at all! But anyhoo!
Looking 'reasonable' does not really pay dividend. It has been the case in Korean Peninsula for decades. They have budged a bit only when they sense that U.S. can really go entire distance. It may sound paradoxical but is true. It is the classic case of Roman maxim, "If you want peace, prepare for war."