Perhaps we read different articles, but I'd say there's quite a difference between a citizen setting up a camera to record someone who is trespassing on one's own property versus a local government mining through metadata to all electronic correspondence to determine petty misdemeanors.
I don't recall the post, so maybe the camera in the article you mentioned followed the supposed perpetrator around for the next year broadcasting the accused's location and social circle back to the victim, but I doubt it.
You're right, I'm sure that claim will be made. I'm sure that claim has been made. But there's a fundamental difference in scope (length of intrusion, amount of data collected, etc.). Maybe in your world the occupation of 'Security Guard" is the same as "Spy", but I don't think most people would agree with that distinction.