The US sure could use groups of people exercising in parks. Think about the reduction in medical costs from the attack on type 2 diabetes.
And what of the lost sleep, the stress of their anti-social ways, on the rest of society. They sound like thugs.
I'd be interested in knowing the full story. Was it some kids kicking a ball around, or was it an organized match scheduled ahead of time on the playing field?
Where I used to live in Seattle, I knew that the grannies would come every week at a certain gym floor. Did they have a reservation? No, but I wasn't going to be an asshole and try to interrupt elderly women dancing and socializing.
(One could however criticize LA Fitness[1] for putting the dance floors and boxing bags in the same room!)
Now if they barged into a professional sports arena and tried to take over, hah, yeah, that's a problem! :)
[1] I actually have a number of criticisms of the old DT Bellevue LA Fitness but since they aren't there anymore, it doesn't much matter.
This is hysterics. Maybe if they interrupted every soccer game, there'd be something to worry about (then to think about, then to again stop worrying about.)