I am almost surprised they haven't come up with some form of drug agent to use on rioters. Brave New World.
Oh, I'm sure THC foggers are not beyond the technological capability of the governments trying to prevent rioting. However, the moment they do that, a different contingent will mobilize... even pro-capitalists will protest the drug use as an abuse of human rights, and pro-capitalism protesters are smarter and more effective. They'd, like, wear gasmasks and stuff.