In case you didn't read it, the 9th circuit upheld the use of Flock cameras. The precedence is as high as it gets, short of a supreme Court decision: https://news.ycombinator.com/item?id=48636421

You're being exposed to a very specific group of people when you read Hacker News or Reddit. Plenty of people are happy to have Flock cameras in their neighborhood on account of the improved ability to investigate crime.