Nor will thumbprints stop lightning from hitting the car but that is as irrelevent as your comment. Thumbprints or some form of conclusive identification will be required by rental agencies should collossal loss rates due to theft by fraud mount. This is not a political issue merely an example of creative private property owners attempting to safeguard their property.
I can tell by you screen name that no matter what I say it won't matter. You "just shut up and take it' sound like a perfect NWO slave.
I can fake a thumb print (or any other finger print temporarily) so easily it ain't funny. There's an old saying; 'locks were made to keep honest people honest, but a thief will always find away around it'.
Do you honestly believe thumbprints will stop the theft of rental cars? If you do than your living in a fantasy world.