There’s no nonviolent state
yet. Doesn’t mean we can’t conceive of one just as Asimov conceived of rules for artificial intelligences long before they were in existence. And just a Asimov’s rules inform people developing self-driving cars, contemporary discussion of imagined nonviolent states will inform development of future states.
Why? It's an instance where violence happens, mainly directed at property. Nobody seems to get upset about it. Certainly there aren't CFC OT threads started about them, right? Why is that?
Firstly, there is no presumption of an virtue in a riot after a sport game. No one is claiming the high ground for the riot. There’s no moral justification for the behavior.
Secondly, as you said, the destruction following sporting events is generally limited to vandalism against property, rather than violence against people. There generally aren’t fire bombs being tossed at the police.
Thirdly, there haven’t been a lot of riots around sport events that I am aware of that have occurred since the Punch a Nazi thread was published wherein people advocated for violence as a political / social tool. That’s really what it comes down to. The topic is timely because people are coming out following that punch saying it is acceptable to be violent to advance their social goals. In discussing the
how,
who, and
where, the
when is also relevant as the concept of violence as a means to effect social change is a timely topic.
Post Script. Additional, railing against violence following a sporting even does little to persuade anyone of anything. Nearly everyone here would say "yup, they shouldn't do that," and wag their virtual fingers. Because it isn't divisive, a discussion of violence following a sporting event wouldn't cause anyone here to change their behaviors or principles. It would merely amount to everyone agreeing with each other.