I spent a year and a half in south Korea in military intelligence. I have an idea of the situation over there. North Korea is not only emotionally unstable, they are paranoid schizophrenic and very dangerous. They may well start a war with the US and/or South Korea.
Nevertheless, what right do we have to interfere in the politics of other countries? Unless there is a proven immediate threat to the US, I question the morality of interfering in the way they run their country.
The US is responsible for the overthrow of several countries already, usually for the benefit of multinational corporations. starting a war with North Korea might benefit the military-industrial complex more than the people of No. Korea or the US.