you (the US) can't let that **** happen to you. We already lost every monument we had. We have a problem with the AntiFa for ages.
Make not the same mistakes we made.
Protect your identity and stay around your monuments on a watch. If anybody with a mask comes near it, defend it and call the police.
Protect and do what you have to do, but always stay on the rules of your local laws. It helps nobody if their media gets more fuel of aggressive right-wingers.
And the most important of all: Get off your ass! Complaining online especially here helps nobody. Get up and protect what you love. If things break down YOU are responsible for it too.
Look at Europe and see what happens.