Why is isolating an individual bad? It’s in a public space. They seem to be using publicly available data to identify people involved in crimes. How is that a bad thing?
As I said, if they are involved in a crime then go ahead. If they just happen to be passing through, or doing something totally within their rights like protesting, then building a database is wrong. That is an invasion of privacy. While certainly there are many different levels, I don't believe we should be arguing how dark the gray is. The line should be drawn at criminal activity - period. It is like taking a picture through a telephoto lens. People have a valid expectation of privacy in their back yard, or house. If they see someone on the street taking photos they might behave differently, but if someone is hiding in a tree from a block away with a telephoto lens then that in my opinion is a clear violation of privacy.