Cars just aren't a good use of space in the context of a city. A person in a car has multiplied their volume by 10 or 20. Sure, sometimes it's needed, for hauling some cargo, but I really think there are better things we could do with all the space required to support everyone owning a car (and, btw, I have one myself, so I'm not innocent) so that they can sit in traffic twice daily and a few times on weekends.
