It depends, whether this is the case with NK as well. As it is, they are indeed subject to a fair amount of our interference, Ideas, or whatever you call it.
But the fundamental issues of a country are poverty, education, shelter, etc. Why?
Well, if you are hungry, a lifetime of servitude to psychological brainwash, would not turn the millions of years of instinct. If that situation worsens, people across North Korea would have been angry, even if they don't express it immediately.
This anger, increases overtime based on atrocities caused by the government.
But imagine, America coming in to NK, in the name of liberalizing the people, and causing more death, famine, and stuff in the process, which is not avoidable.
It would be too easy for the great leader to propagate, and even easier for the people to accept, that all fault lies with America and its allies, thus causing a failure of attainment of objective, i.e to provide people a way to better life.
The war against NK, if it exist, is at the base level. Organizations like RedCross, UNESCO, and others have to be pressed upon.
Not more economic sanctions, and threats to a society, that understands very little about your intention.