Yeah, I suppose I doubt that the kind of people who climb to high position in rigid, paranoid hierarchies, like that I imagine exists in DPRK, are that irrational.
I don't think there's a real nuclear risk here from any one individual, but if there's a rapid transition of some kind that'd be the point where desperation was the greatest.
Under ordinary circumstances, we'd be likely to navigate to a situation where economic aid or the lifting of sanctions is promised in return for disarmament. That's happened in the past. Trump's rhetoric is problematic, as he's increasing the downside risk for himself of being seen to concede.