> by simple virtue of being a car

State and local governments spend a truly obscene amount of money building and repairing roads, and set aside a nauseating amount of publicly owned land to serve as roads, street parking, and parking lots. Those of us who don't frequently drive get some benefit from the roads, sure, because of the efficiencies of shops needing deliveries and whatnot, but not anything close to proportional to what drivers get out of it. And we accept this as the default way that things should be, whereas we assume that public transit needs to "pay for itself".