Police in my city recently "busted" a teen-racer confab in a Wendy's parking lot. Adorable as large groups of teens are, they were driving off business...not generating it. I don't think crowd/nuisance control is a sign of a coming putsch.
If this was just about driving off crowds of teens, I wouldn't be terribly upset, although I think the arrests can not be justified under current Texas law. It's the innocent people who happened to be in the same parking lot to do business with the establishments there who were summarily arrested as well that has my goat.
But, as a matter of interest, the owner of the Sonic said that he made $12,000 a night off the crowd which hung out in the parking lot. They were good for his business, and it was his parking lot.