It is notable that the Christians are being treated the worst. The devil probably lives in Pyongyang.
It is painfully ironic that Kim Il-Sung the founder of N. Korean regime and the daddy of the current leader was born to devout Christian family. His mother was especially a devout Christian during the time when a majority of people around his hometown were Christians. The region around Pyongyang was the stronghold of Christians. Naturally, he must have gone to Church every week and prayed frequently. Some anecdotal source even claims that he worked as a Sunday school teacher when he was a teenager.
But he turned around and liquidated all those christians because he became a communist and they were their enemies. He only cared about power and how to keep it. Nothing else mattered. He went to great extreme to ensure it. That is why N. Koreans were suffering so much. He only rewarded those who are absolutely 100% loyal to him but not somebody who can do better job at running organization or solving problems. All yes men all around. So does his son, the junior "god".
There is an universal maxim: All yes men are either crooked or dismally incompetent. This applies to N. Korea perfectly.