It’s nothing to do with left or right politics, it’s about saying it’s crazy to give a guy credit for taking the world back from the brink of nuclear war when he was the one that took us to brink in the first place.
No, I think North Korea's change in attitude is more to do with the unstableness of their test sites and potential inability to reach their military objectives. Trump was declaring that his nuclear button was bigger than North Korea's just a few months ago, those aren't the words of a peace maker.