We are long overdue for calling these protestors what they are; TERRORISTS!!!
As such they should be put down by any cop who observes their crime. Destruction of property is a Crime. Injury to any person is a crime. Theft of a persons property is a crime. Each of these intentions have been specifically called out as objectives of BLM and ANTIFA. While saying you are going to do something evil and untoward is not a crime, aside from a thought or propaganda crime, as soon as you act on it, it then becomes premeditated or an actionable crime with intent.
When you drop them it can’t stop with one or two, it has to be nation wide, at all of the hotspots with coordination. If you really want this kind of Islamic(esque) terror to stop, you are going to have to Black Jack Pershing it!