Back on topic: The fact that something like Flock cameras is actually legal to operate in the USA is disturbing. And sets a very, very bad precedent.
Right now in Germany we still have kind-of (they're weakening) protections of public spaces. It is illegal to install surveillance cameras that cover public spaces, without going through a permit process. A private property owner who has one of their cameras picking up public space without permission is committing a felony.