This is what communist country do? In my understanding they just have revenge( I dont for what). They dont believe in democracy and want to prove that their system is good. They believe in bullets than in  ballets. Countries having democracy have progressed a lot. You may ask me about China. China has more poor people than any other country.Development is not only big roads, buildings, and  other structures .If it doesnt allow people to express, participate in diferent philosophy, than it is not development. 
Regarding NK, the new leader havent seen what happent to Saddam Hussien. He dont believe in the politics of diplomacy. He wants war, young college kids are trained for war as seen in video footage. 
North Korea is pathetic. What they want is food. And resources. They've got nothing but the Kim's who've run the country are too pig headed and proud to ask for help and want to pretend they are superior. Somehow they expect the rest of the world to thank them for their abhorrent behavior. The oppressed citizens of the North are starving and too weak to oppose the lunatic.
Kim has lost his marbles. He probably thinks that China will be on the side of N. Korea which will never happen. If war is the only way to stop the madness going on in N. Korea, so be it. It's better they be taught a lesson now, then to continue letting them do what they want.