Why do you allow ads from dealers who lie about a car or its details?

There is an ad currently on your site for a car in which I am interested where
the dealer has clearly and obviously lied about the car's features. Why do
you permit, and not police, such fraudulent behavior? I would have
scheduled an airplane trip to see and buy this car, except that I was able to
use a third-party site and the photographs provided by the dealer, to prove
that he was lying. I can't trust your site again.