First off I think this is a very bleak view of the people there and hope you reconsider if you really think the people there are better off dead.
We don't know enough about them to know that they're "too brainwashed". I don't think anyone can be too brainwashed to save. And really, I think a lot of those who are "brainwashed" are only acting in a way that allows them to survive in the environment they are given.
Secondly they're too small of a country to be a major threat to the rest of the world. Really you just need to look at their failed nuclear attempts to know the leaders are like small dogs - lots of bark, not much bite. And once Kim is out of the picture I think the country and its people have the opportunity to make something new of themselves. I guess it depends on how much power the next person in line is able to seize, if any at all. If Kim has a small group of people who would replace him, they could end up imploding by in-fighting for power. We'll just have to see.
I also wanted to note that:
Just because a lot of people say something is true doesn't mean it is. Mass opinion said the Earth is flat many years ago and they were proven wrong.
Try not to fall into those sort of traps, my friend. I'm here to help.
