When someone (or a country) has so many ennemies and must maintain influence by using power, it is not usually all these others that are wrong, but more likely that someone (or country).

In addition, a North Korean conflict will only benefit the US because it will result in the destruction of South Korea's economy that is a major competitor to US business, and will also affect the larges trade route in the South China sea that carries Chinese products to the world. Now you know why the US wants to start a war on the Korean peninsula.