Water cannons?
We can work with you.
Years back I suggested that they add soap dispensers to the water hoses before clearing out Occupy Wallstreet.
“....Water cannons? We can work with you....”
Better yet, give em something to really crap out loud about: roll out the brown note cannon and turn it loose.
Actually I think Grapeshot would be an excellent alternative to tear gas. Just a whiff would quiet things down quite nicely.