I have rented several hundred cars, and have never gotten a damage claim from any of them, even when there was actual damage done. I've had a rental stolen, another was broken into once. Every company I've dealt with has tripped over themselves to look the other way and get it take care of. I do belong to several of their renters clubs.
All it takes is 1 protester and an airport, and that company would lose millions of dollars. The rental business is very competitive.