Frankly, I don't know why I'm having to say this. I'm just stating the obvious here.
The police are obviously totally overwhelmed, and like it or not the military has the legal authority to operate domestically and without them being there more people could've died.
I don't understand your position. There's an occupied building on fire, with children inside. Protesters are attacking fire crews. What is the ideal outcome? I didn't see a fireman with his knee on anyone's neck. Why attack them, if not to cause destruction and murder people?
Arson against residential buildings is terrorism. That's it.
Anyways, you're ignoring the bigger picture, the mountain of bodies that led to this situation in the first place. The civil unrest we're seeing wouldn't have happened at all if policing across the country was done in a sane manner. The numerous reports of unjustified police violence in the midst of this crisis is already making things worse, and there's no need for the military to add to that.