You must not know a big cross section of people then. Maybe in the downtown core, but a trip across the city will show very little available street parking and most houses with garages filled with cars.
It's a small minority of the city that don't have cars.
http://sf.streetsblog.org/2014/08/15/car-free-households-are...
"Census: 95% of New SF Commuters Since 2006 Don’t Drive Solo"
http://sf.streetsblog.org/2015/09/25/census-95-of-new-sf-com...
My point is that in many cases, there exists a reasonable city design and style of living where car ownership feels unnecessary and is better seen as a luxury than a right. Certainly there are many situations where car ownership makes sense, but I worry that people are sometimes too attached to the idea of car ownership and either incorrectly view it as a necessity or assume that everyone else needs a car as well.
[1] https://sf.streetsblog.org/2014/08/15/car-free-households-ar...
Also, given that cars are inherently dangerous, cause environmental harm, and take up a lot of space, it seems like it's in the public interest to discourage car ownership/use.