You aren’t telling me anything I don’t know first-hand. Being ordered to shoot down any foreign warplane is not nearly as close to a possibly illegal order as being ordered to fire on unarmed civilians of one’s own country, so that’s not a very good comparison. Add to that the speed with which events happen in the air and the potentially lethal effects of hesitation, and chances are that young aviator is going to execute that order and ponder its legality or morality later.
I certainly don’t agree with it, I think it would be a goddamn disgrace to attack an allied aircraft on a mission that does not endanger US interests, but I think it would be very possible under the current circumstances.
I honestly don’t think it would happen.
Would our jets scramble? Maybe.
Would they close for a visual? Probably.
Would they fire without being fired upon? No.
As long as the Israelis don’t lock on we’d have no valid reason to engage. And vice versa.