This is all speculation based on no insider insight at all, but is is possible that since Trump had no government experience at all, knew no one in government, knew no one in the military, knows nothing about statesmanship, diplomacy, or how to conduct affairs of government, that he is relying on all those greatest people, the best people, that he said he was going to have to advise him, to appoint the people that actually carry out the policy, and that those people want this war with all their little hearts and souls?
There are some who have been waiting for this moment since 1945. Our nuclear technology has improved so much since then that they have been itching to see how many people can be killed at one time with one bomb since then. Taking out all of North Korea with one attack would be sooo satisfying for those whose live for war, destruction of life, and the pure joy of watching people who are not white suffering.
The generals have been calling for 'tactical' nukes to be used in Afghanistan for years. Trump's ignorance of everything government would dictate that the best, greatest people put in charge of starting wars would come from the dregs of the military, where it is known that no bomb is too big, no number of dead civilians is too many, and if South Korea goes with it. well, I don't drive a Kia anyway. Collateral damage is unimportant, as long as the world understands who's number one, and who's ready to destroy the world as we know it to prove that.
What I really asking I guess is: Is Donald Trump so incompetent, so obtuse and so detached from reality that he has unwittingly unleashed the military to do what they have been trying to do for decades, and that is start the war that will end humanity because they think they can win it?