Most people want cars sure, but not the drawbacks. Many people would like to listen to loud music or practice target shooting outside their home, but if everybody did that it'd make for really shitty city living.
I think a lot of people in the US simply don't realize or consciously acknowledge how inconvenient car-centrism is, so they only think of the personal convenience their car gives them, rather than how inconvenient things become when everybody uses cars (ie the conveniences cars afford are in many cases only because we've developed around cars). Most people probably hate not being able to walk a few hundred feet to the store to get some milk, or don't realize how nice it would be (because in a lot of the US it's such a bizarrely foreign concept) to have that as an option. They probably hate that the only way to get to work is to commute during rush hour with tons of traffic, or that their friend in the same urban area is actually 80 miles away, or that everything is covered in asphalt and the air sucks.