ALPRs are just one small part of the surveillance state, and even if you were to trust the state with absolute surveillance, it is virtually impossible to prevent bad actors with government employment from abusing the technology to stalk and harass people. There are plenty of documented cases of police and others with access to these tool using them to harm people like ex-wives, etc. I personally have been subjected to a long-term (multi-year) campaign of stalking and harassment by people with access to state-owned surveillance technologies, with the goal being to drive me to suicide, and I know I am not the only one. It was a complete nightmare.