Although it's impossible to know for sure what every North Korean really thinks or whether this is all for show, there is some evidence that some of this can be taken at face value. I say this because I've seen some interviews of ex-North Korean prison guards talking about doing savage things and enforcing unimaginable conditions on political prisoners- in many cases, people not charged with any crime other than being related to someone who has been charged. These guards after later leaving North Korea said candidly in interviews they had no problems handing out the most severe punishments- even to children, since they were related to traitors. Didn't bother their conscience to torture and execute anyone. They at least believed in all of this, maybe the rest is a mix of belief and compliance out of fear, but I wouldn't rule out the possibility that there are true believers.
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No one gets out of here alive.