Howard Zinn, Chomsky, and most other anti imperialist intellectuals viewed history similarly badly and are looking almost as stupid in retrospect as Fukuyama did with his claim that history has ended. For every example they bring up, there's 5 counterexamples that they didn't bring up because in some cases the evidence for the good they did is locked up in a spooks SKIF for the next 50 years - or in other cases they didn't bring it up because America just isn't allowed to be the good guy anymore if you personally took part in America doing bad things.
The amount of damage that folks like Marx did through making people believe in telelogical views of history ( i.e. "Capitalism is GUARANTEED to destroy itself due to internal contradictions") is colossal.
Shit bad regimes which are based on lies are now stronger than ever. I'm willing to bet $$$ that not only does NK exist in 50 years, but it's stronger than ever and even more authoritarian. AI literally locks in power structures and perfects them.