"but would this still apply when shooting civilians, even with rubber missiles?"
From a historical perspective of civil wars where the military splits the unenviable dynamic of shooting one's fellow countrymen is often forgotten and replaced by a mindset of enemy against enemy, which escalates with the death count and the inevitable search for revenge - on both sides. As it stands, Trump is egging his military and sycophants towards retaliatory violence where deaths would be the likely outcome; the spark that could easy engender mass civil disobedience to set the stage for civil war. America stands on the precipice IMO, Scoto.