The US are warmongering idiots.
Poke even a placid animal with a big stick enough times and it will eventually attack you, let alone the rabid crazy nut job that is Jim Kim Jong-un.
Best solution is either ignore until it eventually gets bored and goes away, or find a more sophisticated solution that doesn't involve shouting at each other and threatening/actually pressing the big red button.
so they're actively threatening other countries in the region + the US while developing nukes and letting their people starve partly as a result of the ridiculously disproportionate amount of GDP they need to spend on their military and the US are the warmongers?
.