I cannot believe that if a deranged sitting President would task the Army (or whatever branch) with bombing a random country, the safeguards in place wouldn't be common fucking sense in all those involved.
By the way, you seem to have misunderstood the intended lesson of the apple and the barrel. The point of the proverb is that it takes only one apple to ruin the whole barrel, not that just one bad apple is not a problem.
Maybe things have changed in 10 years, but even the most racist southern farmer I knew in the officer cprps wouldn't have bombed am American city, for several reasons.
The US military is responsible for many atrocities, but I'll eat my own dick if a US military officer ever bombs an American city.
Also, thanks for the patronizing remarks, no one uses that phrase as intended and it's now become less likely anyone would use your version. The bad apples in the military officer corps get removed very quickly, I bet your example will be court martialed and ejected with dishonorable discharge by springtime. If I had been his CO, I'd have him on literal bread and water on his way to federal prison for life for his acts, and most officers I know would do the same; the rest would probably want to shoot him.