Doesn't matter what the dopey mayor, or police chief, or governor think now. It's a matter for Bagpipes. But will he squeeze them or will he just blow?
Antifa targeted the federal courthouse
If that is exclusive jurisdiction US property you are absolutely correct. Just like an attack on Ft Sumpter.
Negotiating or going along with these anti societal behaviors is like negotiating with a recalcitrant young adult. These are the choices, go along and let them do with they want even if it includes them directing what you will do in your own house; setting the law down by force if necessary; and ultimately if they do not agree to heed, putting them off your property. Today’s absentee parenting or worse parenting as a friend has given us the circumstance of these little Hitlers thinking they are in charge.