The sheer amount of emotive epithets is a dead giveaway.
It's not even a closed country. It's not hard to visit (unless you are the US citizen and your own government forbids you to) and there are lots of North Koreans outside North Korea in other Asian countries. There were much more until 2017 UN sanctions, restricting hire of North Korean workers.
To understand the real reason behind the sorrow state of modern day North Korea, one has to simply acknowledge the fact that North Korea has been pushed into isolation by much more powerful actors for more than half-a-century.
It's as simple as that. "Tyrannical rule of Kim Jong Un" has no tangible effect here.
The only tyrannical actor here is an entity trying to achieve its political goals by making North Korea inhospitable.
Unfortunately people are naive and arrogant enough to be convinced that this is actually a good thing, that it's worth it, and that they are actually helping instead of actually being the tyrant. It really strokes their egos - who cares about collateral! And all you really need is a nice narrative, woven of cherrypicked and properly presented pieces of reality.
We're undermining a tyrant here, can't you see we've been doing this to you for generations for your own good? As long as it's a glorious cause, it's clearly all worth it! At the end of the day, if North Koreans want to live decently, they simply have to collapse their country and that evil regime. And don't worry, we'll totally help you how we helped Libya wink-wink /s