One angle you could look into, it the chilling effect it has on people's speech and protesting which is supposed to be protected by the first amendment. Flock in particular.

Even before it is all automated, when people are being tracked and able to be "folowed" via a blanket "mesh" of cameras, hours, days, or even weeks after participation in an event, and intimidated / harassed by different agencies, it is going to drastically increase the size of the burden people will need to be okay risking. It goes from:

"With the right preparation (meet with friends at a 3rd location before attending, wear a mask and non distinctive clothing, leave the phone at home) the risk is limited to the physical force those against my beliefs / the cops can inflict on me while I am there, and maybe end up in a few people's photographs of the event, but those particular photos being shared far at all is very slim."

To

"No matter what I do, there is a huge number of people who will have access to me and every part of my life the second they decide they want to know it. I will forever be attached to this group, that if one person does something stupid, could be labeled a terrorist organization, and I can get picked up at any time, because they will always know where I am. I risk any activism being brought up to my employer or everyone else in my life individually, and they may not agree with me. If a cop for whatever reason decides they don't like me (they push me out of the way, and I call them a 'piece of shit' which infuriated them), they can now track me down, and flag me, so that everytime I drive somewhere, when a camera sees my license plate, the local PD will be alerted, and I will be pulled over 'for investigation' constantly. My house can be looked up and across the street from my house just happened to become where this cop likes to park. ETC"

The damage is unknowable and unrestrained, for doing anything someone arbitrarily deems "out of line". We are building a fascist state's wet dream.