If we wanted we could destroy all of North Korea’s nuclear weapons in a single strike before they even knew what was happening or had time to respond
I’m not sure about that, they have mobile launchers and even if you could destroy all the nuclear assets in seconds, it doesn’t account for the thousands of artillery pieces in place and ready to fire on Seoul, before you could take those out, much of Seoul would be in ruins and thousands of people would be dead.
Paraphrasing Mike Tyson everyone has a plan until they get punched in the face. North Korea will get a say in how things turn out.