I've given this a lot of thought.

Unfortunately, in addition to being dangerous to others, this approach pretty much always comes with increased exposure to prosecution and increased penalties.

The optimal approach seems to be vandalism - spray painting over the front of the cameras, placing other objects to block their view, or permanently blinding them with lasers. All of these things are still illegal and would likely subject you to the legal system, but they at least require on-site intervention to remedy and keep the actor out of prison (but maybe not jail).

The least risky approach I've found is also the least effective - they're often on public property, so place _yourself_ in front of them. It takes them out of commission for a while and should be legal. Coordinated action would likely get the attention of Flock, law enforcement, and the media. Unfortunately, even that could be construed as "interfering with law enforcement operations" or similar, and/or conspiracy if you're organizing or participating in mass resistance.

If the federal government decides they want to step in on Flock's behalf, they could put you under the jail. :\