And I do actually want immediate arrest and physical removal to be the default first response in a situation like an effective protest. I do not want people to get away with disrupting the public commons and then claiming that they were justified in doing so because they were carrying out a protest. Indeed, I want the police to immediately arrest and physically remove anyone at all who is disrupting the public commons. The police are a weapon, and I want that weapon used effectively against people who disrupt the public commons, so that the public commons can be usable by everyone.
I don't think that the entirety of the public commons needs 100% uptime. Occasional disruption could happen for any number of reasons like temporary events, construction, and protest [0].
"Immediate" action is such a strange requirement to have. Such a desire seems like a waste of police time. Like in TFA's example , the commons were ever so slightly disrupted: anyone could have gone around the woman. Occasional minor to moderate disruption of the commons for the purposes of free expression is a feature of our society that I think should be maintained.