Japan invaded and colonized the  sovereign nation of Korea in 1910, and its been downhill for the northern Koreans ever since. Kim Il Sung, Un's grandpa, is a George Washington like figure, leading a resistance that achieved success after the U.S. Military entered the picture, bombing the North far beyond any strategic purpose, earning the enmity of the Korean people that lasts to today. The Kim's regime makes sure they don't forget it. No need to psychoanalyze Un,he's just following the game plan.