The interesting part is the conflicting twits from dearDonaldTrump. First he calls the dowening of the US$130 million or so drone a 'big mistake Iran made', next we hear Trump recalled a counterstrike he had ordered. Of course ignoring the reason for ordering the strike he put emphasis on "it would have killed 150 people" and to top it off he suggest "it may have been some overanxious general who was loose and stupid".

"“I find it hard to believe it was intentional if you want to know the truth. I think it could have been somebody who was loose and stupid that did it,” Trump told journalists. “It was a very foolish move.”"
www.theguardian.com/world/2019/jun/20/iran-us-drone-attack-trump-response

"Trump says he stopped airstrike on Iran because 150 would have died
US president tweets that he intervened 10 minutes before planned retaliatory attack
...
Trump tweeted: “We were cocked & loaded to retaliate last night on 3 different sights when I asked, ‘How many will die?’ ‘150 people, sir’, was the answer from a General. 10 minutes before the strike I stopped it, not … proportionate to shooting down an unmanned drone.
...
Republican hardliners bitterly criticised Trump for aborting the strike. Liz Cheney, a Republican congresswoman (and daughter of former vice-president Dick Cheney) told a rightwing radio talk show: “We simply can’t allow America’s adversaries to think that they can shoot down a US military drone with impunity.”
..."
www.theguardian.com/world/2019/jun/21/donald-trump-retaliatory-iran-airstrike-cancelled-10-minutes-before