...try bringing your cat to the vet on a bicycle in a thunderstorm, or walking fifteen minutes with him in a moderate rain to your bus stop. Try going on a date with someone with no car, or working second or third shift and have to go home in the midnight hours on a train with sketchy as hell people. Try bicycling to work with a decent cold, or having to work a 12 hour shift doing manual labor and then need to bicycle back 30 minutes.

Really, there are plenty of use cases for cars. Right now where I live its incredibly cold with biting winds, and bicycling or even walking 20 minutes to a stop and waiting in the cold would be murder.