People commit minor offenses, and often felonies without knowing it, on a regular basis. If surveillance was consistently used to actually enforce the laws, people would a) notice the surveillance[0] and then actually object to it and b) start objecting to all the ridiculous and poorly drafted laws they didn't even know existed.
But they don't want the majority of people objecting to things. They want a system that provides a thousand pretexts to punish anyone who does something they don't like, even something they're supposed to have a right to do, by charging them with any of the laws that everybody violates all the time and having the surveillance apparatus in place so they can do it to anyone as long as it's not done to everyone. That doesn't work if the laws are enforced consistently and the majority thereby starts insisting that they be reasonable.
I guess they have to deal with so many annoying complaints, so they are really happy if there is something joyful once in a while.