re: How do you get this to stop?

Exactly, don't just stand there after they are throwing water, glass bottles, etc at police. After the first bottle thrown, attack, apprehend, arrest, send to jail, repeat. Tell them to go home as that one bottle has now taken this from protest to unrest, and if you don't disperse, then arrests will be made. ID the ones throwing the bottles and inciting this shite, and beat the everliving shite out of them. Shoot rubber bullets into the crowd, if they don't leave and still throwing projectiles at cops, then shoot with live rounds.

That shite about standing there and letting them get 5 times the police size will not get the police anywhere, just make the crowd more aggresive