A friend was with the 82nd Airborne deployed to Ohio during the turmoil surrounding our involvement in Southeast Asia. His unit had been well trained in crowd control and de-escalation.
The National Guard OTOH had just come from a very tense miner's strike, were overtired, not trained in nonviolent response to provocation, and sent into an increasingly violent scene where protesters were burning buildings and so forth.
They were also issued live ammunition.
The decision was made to use the National Guard for the sake of legality, resulting in "four dead in Ohio."
I'm trying to think of a conflict between rioters and military/paramilitary forces that ended well and nothing comes to mind.
During the Chicago Democratic Convention, when the cops started talking off their badges it was time to get out of Lincoln Park ASAP. The optics helped Tricky Dick beat Hube the Cube.
In Chile the Carabinieros expressed sympathy for protesters wanting a new constitution. It was pretty contentious, but a new constitution eventually resulted so I suppose that's about the best outcome I can think of. Since the bulk of the protesters were in fact peaceful people showing up after work on Friday, the tone was somewhat different.
The leadership of current administration is given to such inelegant handling of E) All the above that the actual merits of their position on one thing or another become largely immaterial. A policy that could make perfect sense if implemented by someone competent becomes lunacy at the hands of Trump, so it becomes problematic. He has the Midas touch where everything turns to shit and gets gold plated.