“Why waste high priced ordnance on mussies?”
Because you only want to hit the baddies. All Muslim sects have an honor code to come to the defense of innocent Muslims, particularly if they’re attacked by non-Muslims. Being allied with a Shia minority and bombing innocent Sunnis is a great way to stir up volunteer Sunni jihadists from 100s of million Sunnis. We’ve walked this tightrope for 12 years in Iraq and are still there.
The Muslims will always be able to drum up some reason for jihad. Doing it this way gets the war over with sooner.