Umm... America's been this way for a long time. At major events, protesters are usually confined to "
Free Speech Zones". If protesters want to move around at all, it has to be along a pre-approved route, and they typically deny any route that goes near anything important. There's all kinds of other paperwork and permits required as well. Most of the protest going on in the states this past year is of a kind that can be labelled illegal and treated as such in a heartbeat, whenever authorities wish. It's just not possible for them to go around arresting everybody and they know that doing so just makes things worse anyway, so they mostly resort to intimidation tactics. They make as big a show as possible of arresting groups of people, target important organizers, confiscate equipment, and if none of that works they shoo the media away as much as possible before going in and violently dispersing everyone.
Yes, it's true that protest is a cornerstone of democracy, and a good democratic government restricts protest rights as little as possible. However, we do kind of need to accept that protest is literally conflict with authority. If it isn't disruptive and if authority does not respond with intimidation, then... what do you think you're accomplishing? Might as well sit down for tea with your enemies and throw in a casual remark during polite conversation about how you're kinda concerned about their behavior. Those in power need to feel threatened. They need to KNOW... well... basically this. I just can't say it any better than this. You can't just threaten with words. You need to
demonstrate exactly
THIS. If the public cannot at least fake preparedness for that level of opposition, then the powers that be can really do whatever the fuck they please.
Edit:
This is... the absolute most amazingly stupid thing I have ever seen anyone in power do.
Actually,
this beats it for me. Maybe not stupid, but...