Don't blast military grade tear gas at them. Don't club them. Don't fire rubber bullets at them. Don't shoot them with beanbag rounds. Arrest them. I don't even think you need to warn them, although that's polite. These aren't real mysteries here. Take out your phone, video tape them breaking the law, and then arrest them using minimal force, arraign them, and seek a successful prosecution.

"Provoking the cops" isn't a thing, for the same reason you don't 'provoke' a WaffleHouse employee to give you a soda. Police provide a simple service: investigating crimes, arresting suspects, and assisting in their prosecution. If you aren't breaking the law (e.g. yelling at them, calling them fascists, etc.) our public standard is that they just keep an eye out for lawbreaking. Law abiding behavior ought to be transparent to them in their professional capacity. If you are breaking the law, they are duty-bound to arrest you with minimal necessary force and make sure you're charged.

Local jurisdiction matters. Federalism matters. And they don't matter because they get better results! (I'm skeptical they do.) They matter because our government is built on checks and balances. All power comes with limits to that power. Ignoring those limits is just as much a lawbreaking behavior as property destruction. Local law is handled by local cops, and those cops are duty-bound to enforce it.

There exist great conversations about why we aren't getting this, and it's interesting and situation-specific (the Portland case in particular has a lot we can learn). But I've not really heard from a lot of people who think this isn't what we should do, so I think it's important to say it*.

* The pandemic has taught me to say obvious things here, because if America felt the instinctual, every-single-person anxiety over the coronavirus I felt in Taipei on and a bit before Chinese New Year, many, many more people would be alive. A check puts that at January 25. I posted about how disinformation was making the explosively bad international pandemic worse on February 4, but have been relatively silent because I assumed everyone had the same high-quality news sources as I do, and I had little to add. But that's just not the case, I guess. The disinformation wasn't just active, it was passive, and I apologize for not stating the obvious more often.