Do you shit up every thread just for recreation? Trump will be gone sooner or later (hopefully sooner) and NK isn't suddenly going to turn into Sweden when DJT passes from the scene. Eventually we'll need to deal with the reality of the world like it is and stop treating places like NK and Cuba with the same approaches that haven't worked in 60 years.
North Korea has nuclear technology. The best thing that we can do as a country, is stop ramping up rhetoric that could get thousands/millions of people killed, and act diplomatically.
Now, assuming Strongman Trump isn't just doing this because he likes Jong Un's style, the hard work begins, in which the US ties US relations with the NK government to NK's government actually doing things that can help the people/stop murdering its own people.
It shouldn't surprise anyone that NK is a total basket case. They've been demonized, often for good reason, for 60+ years, and they also have the strongest Empire in human history massing troops on its border (nevermind the war it fought there) for over 70 years.
This isn't some victory for Strongman Trump, as it is an opening.
My concern is that Strongman Trump is doing this for the wrong reasons.
All of that said. How could anyone think that diplomacy with NK is good, but, diplomacy with Iran, and especially Cuba, is bad?
Cuba's totalitarian government would have collapsed decades ago had the US maintained relations with it over the past 60 years. But you isolate an already isolated place, and it can tough it out and like an organism evolves to be something different, that isolated country can evolve its own particular culture and identity. And then it's much harder for it to "change" after.
Relations with Iran also need to be thawed. Obama attempted to do it, but Strongman Trump and Friends seem to actually want to start murdering Iranians live on television.
There is plenty of good that Strongman Trump, or any US leader can do. None of it involves murdering people on television.