I can see what you're saying but typically Lexus cars are stolen for spare parts or for shipping overseas - not to be thrashed by a couple of joyriding yobs (there are plenty of hot-hatchbacks around for that purpose). From what I gather, the thieves drive the car to a quiet location somewhere and wait a day or two to see if the owner finds it. In this scenario the tags may prove invaluable and, assuming that the thieves hadn't caused too damage in the method by which they stole it, I'd probably want it back.