But that's silly. Everyone agrees with you but what if you need to go to your grandparents in the country side village of 200 farmers ? You could build a once-a-day bus line or you could just let people take a non polluting car from a lot outside the city.

Cars are not the problem: it's their aggregation in dense city + their pollution. Remove the pollution, people stop dying, we can then discuss your dream of perfect public transport for optimization's sake.