[Willy]

Quite right any visible camera, depending on the setting is fair game for thugs. In a modern london with cops a few minutes away, it may be difficult to destroy them faster than replacement, not to mention it´s a good chance you get caught.
In a distopian setting with the cops not wanting to enter some hoods or not enough money for replacement and police it´s the other way around.

Iwrote visible for a reason, modern cammeras are quite small and will get even smaller in higher TLs, so a lot of them may be to small to detect. But raw data is one thing you need either staff or tech to use the cameras in a way that makes sense preferably both. Not to mention most cameras record only for some time and overwrite the stuff than. Keeping all data from thousands of high resolution cameras will make enormous server farms necessary and steady rising costs.

By the way most cameras using night vision are next to useless if you wear a baseball cap with a few LEDs shining in a infrared or nearinfrared spectrum. They never have a chance to get a picture of your face. They are even hard to detect because people don´t see the light emitted from the LEDs.