North Korea has two nuclear reactors, presumably with tons of of spent fuel on site. Do we have the will to create another Chernobyl? Cause that’s where I’d wide my bombs and vital components => the one place you can’t ethically bomb.
This is how I would go about it. On the first night when the winds are blowing north, launch a tactical nuke strike of the front lines and take out every piece of Nork artillery and most of the Nork army in one fell swoop. At that point, nothing can come south without being destroyed by radiation.
By doing this, civilian populations are unharmed or damage is minimal while at the same time the North’s fighting capability and 60 year old strategy is gone. If Kim decides to launch a missile at the US, Japan or South Korea, ABM batteries are spun up and a secondary launch prepared once the North’s missile(s) are shot out of the sky or destroyed in their launchers. The US counter strike then is aimed at the North’s leadership since they will all be with Kim.
The entire war won’t last more than an hour, millions of civilians are spared death and China can clean up the mess. There would be no way in hell that the UN will declare the US committed crimes against humanity since the strike was designed to preserve humanity, unlike 100,000 artillery pieces aimed at the civilian population of Seoul.