They've made this situation hard for themselves because while there is a practical reason to keep track of at least some of these protest activities but they've also shown themselves incapable and untrustworthy in handling their own affairs.
Retaliation from police is a real and documented fear (I mean look at harassment of women who accuse a police officer of domestic violence) and incidents like not having any body camera footage is sadly much too common to believe the police can handle these situations in good faith themselves and ensure that first amendment rights are respected.
The trust between them and the populace is broken and, at least the cities I've lived it doesn't seem like they are going to repair it any time soon (specifically the police in Chicago were a dumpster fire when I lived there. I knew someone whose dad was on the force who described the Chicago police as simply "bad people").
Some monitoring of protests is necessary to ensure the safety of protestors and keep track of the potential for violence or other crimes from protestors or opportunists. For example I went to a BLM protest and it was pretty chaotic and there were counter-protestors and some minor vandalism of the local courthouse. Seeing how I was at a BLM protest I'm not a police fan but it was a chaotic situation with the potential to escalate so it so they should have a handle on what's happening and what the dangers are. It's an extreme example but January 6th is a good example of what happens when they misjudge those things.
Edit: to be clear in the case of the BLM protest I went to the organizers coordinated with the police so I'm not aware of any particular surveillance for it.
I agree the police should maintain public safety. I'm not convinced they should be monitoring public discourse or allocating resources based on that monitoring.
Atlanta PD even agrees with me on that last point:
> Moreover, throughout its intelligence reporting, the department acknowledges that public engagement with online postings does not necessarily correspond with the likely size of an event, suggesting that this monitoring is hardly useful for resource allocation.
If event organizers want to request police presence that's fine. But I see no reason police should be expected or even allowed to use surveillance to predict the needs of such an event.
"I'm not convinced they should be monitoring public discourse or allocating resources based on that monitoring." I have no desire to convince you of this and I definitely haven't been arguing for this at all.
I have no idea what monitoring they should do, just that they do have an interest in knowing major protests in their area.
Edit: put yourself in the shoes of a policeman trying to do your job in the best way you can then ask yourself "should I know when protests are happening in the area I work in and what the general situation is during one?" All I'm saying is that the answer to that question, to me at least, is yes. I don't think police need to entirely stick their heads in the sand in regards to protests. This argument is all stemming from a throwaway line in my original comment and I neither know enough to coherently argue nor care enough to argue specifics of implementation.
Retaliation from police is a real and documented fear (I mean look at harassment of women who accuse a police officer of domestic violence) and incidents like not having any body camera footage is sadly much too common to believe the police can handle these situations in good faith themselves and ensure that first amendment rights are respected.
The trust between them and the populace is broken and, at least the cities I've lived it doesn't seem like they are going to repair it any time soon (specifically the police in Chicago were a dumpster fire when I lived there. I knew someone whose dad was on the force who described the Chicago police as simply "bad people").