There's nothing inherently wrong with the concept of ANPRs (automatic number plate recognition) as these are called in the rest of the world. It's more of an issue that there is a complete lack of laws surrounding how that data is to be used, and especially when it's controlled by a private company. If there were strict laws limiting the situations where ANPRs could be used, such as requiring a warrant to begin searching for plate numbers and automatically discarding data from non-matching plates, I doubt people would complain as much about these.