How many organizers are there compared to participants? How are the participants supposed to know the police intrusion has been agreed to? How do you know there aren't participants who would choose to align themselves with the "autonomous bloc" over the police? Assuming all "good"(work with organizers) demonstrators work together, how would you give notice without giving the "autonomous bloc" ample time to disappear into the crowd? It isn't like the demonstrators are surrounding the rioters and/or opening a path for the police.
As for using tech to track rioters, perhaps it is far from good enough in protest situations. I imagine it is hard to get a hold of enough data to train for that situation. Perhaps the police have been prevented from using it. I know Clearview AI tech has already been banned in a number of places.
Did you ever go to the police to find out what you could have done differently to prevent the indiscriminate charge?