Certainly there must be a few dissidents here or there, but the majority really do believe everything they are taught. There is no reason for them not to. From birth they are conditioned and never hear an alternate version of anything. Very successful indoctrination. That indoctrination of the Juche philosophy manifests the isolation and paranoia. It's a philosophy of self reliance. One of their favorite mottos is "We have nothing to envy". They believe they are the pure race. The people think South Korea is a hell hole and that the North is a heaven.
It's not as if these people know they are being suppressed or know that it is wrong (besides those in the slave camps perhaps). Through their propaganda they wake up each morning thinking "today is when the US attacks". They delude themselves into thinking the suppression is simply "what needs to be done" in order to defend themselves.
Despite this brainwash the North Koreans as a people are extremely humble and pleasant. When I was visiting I was told at all times what to do. I could not leave my guides side. He told me who to talk to, what to eat, where to sleep, what to take photos of. However I did get to talk to quite a few people in impromptu settings. They are very curious about me and the world, but nothing will stray them from their brainwash. No no way did I try to argue with them, it would be a waste and very very rude. A few times I tried to tell them I was American (i figured out the Korean word) and some of the facial expressions were great, most didn't believe me. Thought I was British.
It was a completely bizarre but fascinating place that is very misunderstood (not to say nothing is wrong).
Here are my public photos if you are interested. I even met with a 4 star General at the DMZ! We talked and he mentioned he wanted peace with the US. haha go figure!
http://www.facebook.com/media/set/?set=a.10100229278541028.2548594.26701563&type=1&l=2e56741d9f