Given how wasteful they are, that's the only good justification for cars. But per the social model of disability (
https://www.scope.org.uk/social-model-of-disability):
> The model says that people are disabled by barriers in society, not by their impairment or difference. Barriers can be physical, like buildings not having accessible toilets. Or they can be caused by people's attitudes to difference, like assuming disabled people can't do certain things.
in areas without usable public transport, everyone has this "disability". Individual action can't make public transport magically appear: only policy changes can do that. (Or anarchically setting up your own public transport, I suppose, but that'll probably get you arrested in America.)