The stolen cars thing seems to be the goto for making these okay in places. People think about a car being stolen or carjacked and want the masked armed robbers taken out. However I believe most of the 'stolen cars' they are actually looking for and finding are cars where someone is being in their car payments and a repo notice gets sent out..
technically the car is stolen from the place that holds the note.. but I don't think the malls and other places that have installed these and sold the data are really wanting to put our press releases about how many broke people late on their payments they turned over to repo men/women..
They used that excuse to put some in at the airport near here, but I have second hand knowledge that they have been used to Id other people and investigate other things, so that data is not in a read - only - plates put into the db that are stolen and get info back, it's db data that is there and searchable shareable for other reasons, most the general public may never know.