KingTigerTank is hilarious. Clearly he knows something we don't. o.O
"There are no Muslim extremists in North Korea so I don't think it would be as problematic with regards to insurgencies. The new government might be weak or something but at least there would be no violence once formal hositilities ceased."
I think you find that once your country is invaded, your home destroyed, and your family and friends killed, you have plenty of reason to become an "insurgent". Combined with the fact the North Koreans are highly nationalistic and convinced that the world is out to get them, as they've been convinced by mass propaganda, an invasion will be extremely costly in "civilian" deaths.
"This is why, in the end, I decided to totally reject Marxism. Any ideology that believes that the system that runs NK is superior to the system that runs the US is fundamentally flawed."
I would not call NK Marxist... I would say it tinges more of authoritarian/dicatorship, more in the style of Stalin than the ideology described by Marx. I'm the opposite of a communist, but it would be a folly to say that NK's problems are simply the result of a flawed economic policy.
Honestly, I'm not sure what will happen. America has certainly gone to war with countries for less noble reasons than it would be by attacking NK... I'd say that we should leave this mostly to China, and to a lesser extent, Russia. It's so hard to say because NK is such a reckless mess (much more so than Iraq)... and SK is in a vulnerable position if NK decides to go berserk.