The issue that it gets into is that the license plate tracking is now sophisticated enough not to just for law enforcement or skiptracking, but has moved into general data collection that maps your location and behavior even if you're just a regular joe. It's not the government, it's individual companies. And because they supply the data to the government, they somewhat get a free pass and don't get regulated.
The companies that do this started as skiptracers, but now they will go ahead and sell their data to anybody who wants it.
For example, they see your plates at a bar, then perhaps they start sending you bevmo coupons. They see you at a casino, they start sending you other gambling related things.
If you go to the gun range, they know you are interested in firearms (I don't see how the conservatives would be OK with this, when they equally get huffed up against background checks put them on a "list").
This is something just like the whole NSA phone tracking "scandal". Sure if you have nothing to hide maybe you don't care; but you should respect that many people do value their privacy?