What about the people who live in a city but regularly need access to a rural area to visit relatives. At least in the UK mobility in the rural areas is effectively impossible without a car. If one has a life entirely in the city there is no option but to own a car in the city, say London, and use it to traverse the city to get out.

In London at least, during a normal working day 95%+ of traffic is commercial in nature. You can't stop that kind of traffic without stopping the ability of the city from functioning.