And then an angry North Korea lobs a few or tens or hundreds of artillery shells into South Korea.
Now what?
So far as I know, the GBU-43/B has to be dropped by a cargo plane. That plane has to be fly over the target. What's to prevent the North Koreans seeing a possibly hostile plane on their radar, investigating, seeing that it is not a stray FedEx flight, not waiting for us to drop the GBU-43/B, and shooting down the plane?
And would you wait for the North Koreans to commit a hostile provocation, or should Trump order it to be dropped, just for the helluvit?