It’s not the ROE in question here. It’s the willingness of American military to kill other Americans.
Kent State? Waco?
Since there’s no such thing thing as a moral absolute, following orders is just another choice, one that will keep the obedient out of trouble.
Do you put the National Guard in the same category as the Marines, Army, and Navy?
Waco ...National Guard
Kent State...National Guard
Abu Grab.....National Guard
Joking in front of coffin/posted to YouTube....National Guard