Sadly typical urban teen savagery.
When a bunch of urban teens get together in a public place, their inevitably posting about it on social media will draw even more of their buddies and others to what they come to see as a big party like moths to a flame. The bigger the numbers get, in turn, the wilder and harder to control they become, until a disagreement inevitably happens among two or more of them that almost immediately escalates into violence, which turns into a brawl, which turns into a riot.
The place's owners then declaring the park closed, in turn, further enraged them and caused them to turn their aggression on the owner and the park in general.
It's the way of things with urban teens who've had no effective parenting to teach them limits, are immersed in a culture that openly glamorizes violence and lawlessness, and have a belief that they're entitled to everything they want in life.
And, of course, the DUmmies have no problem with none of them wearing masks and gathering in large numbers (As is the case with the BLM and Antifa rioters), but believe that gathering in church even with masks and social distancing should be illegal.
No, you're wrong, since the rioters the feds are arresting are also mostly white.
Good point.
I'd also point out that the DUmmy AleksS's claim that the teen rioters HAD to have been white on the grounds that there were (At first) no pictures of the rioters and no mention of their race is a complete crock. I've observed the opposite is true in cases like this; They make a point of avoiding mentioning the races of the teens involved when they're minorities unless it is absolutely unavoidable. It's kind of the same reason why, when Muslim teen gangs cause problems in England, the media reports on it refer to them as "Asian youths" or similar misleading euphemisms.