He couldn’t identify with David, a Jew, could he?
Don’t you see, that’s the difference. David WAS a Jew, and had God on his side, tipping the balance against the mighty Goliath.
The Current Occupant, not believing in the God of the Jews and also now of the Christians, does not have that divine support.
This time, Goliath might win against the copycat “David” now pretending to be some kind of champion.