You're all ignoring the fact that N Korea poses a direct threat to Japan and S Korea. It literally only takes 5 minutes from time of launch for a nuclear missile to reach southern japan from N Korea. Our continued military presence in Japan and S Korea (at their request) is the only thing holding them back. N Korea is not rich with natural resources and does not have adequate fuel to get a majority of their aircraft into the air and are desperate. Do a little research on N Korea and Pacific Rim military history involving the "Harmless" N Koreans and their leader. Here's a little snippet about Kim Jong Il that I think is rather fitting.
taken from an article in Salon.com Undertstanding Kim Jong Il
Jan. 10, 2003 | Kim Jong Il likes Daffy Duck and fast cars, and before he became North Korea's dictator he wanted to be a film producer. He was born on the peak of a sacred mountain, he says, and his birth was attended by thunder and lightning. In 1978 he had spies kidnap his favorite South Korean actress in order to improve North Korean cinema. His agents were implicated in the 1987 bombing of a Korean Air flight, killing 135 passengers, intended to scare away tourists from the 1988 Seoul Olympics. While his famine-starved people eat tree bark to ease their hunger, he dines on steak and cognac in the company of the "pleasure squad" -- a variety pack of imported blondes and Asian beauties.