Thank you for your honest answers, this is an interesting thing to think through.
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.