This is why I hate the modern lefty in international politics.
They have no concept of realpolitik, and that if you get a chance to defuse a major rogue state, you take it, in good faith, even if the price is no justice for the millions of people Dear Leader abused, beyond the hope that they may be the last ones and an ultimately friendlier regime emerges on the scene in the next 15 - 20 years, and may someday integrate itself into the First World as at least no worse a place than your average communist state..... it may even be stable enough someday to admit it did wrong, but it's going to have to at least get some formalized and non-belligerent ties to the modern global community as step "1", and these progressives will torpedo that out of spite if they can because their dogma says wrongthinkers/wrongdoers must be punished as step "1".
Their moral righteousness says the only acceptable outcome is Kim in jail cell, even if the entire Korean Peninsula and everyone on it ends up glowing green as a result....
As much as they go on and on and on about how they don't want a religious Republican in charge because the nightmare scenario is going to war for petty reasons (God says so!) , the left is just as bad because they'd walk away from peace treaties for equally petty reasons (the document doesn't specifically mention the abuses suffered by trans people!)