Also light transport works great for for single people and dinks. Once people have kids they likely would want a car. By that time you don’t want to do daily shopping and you don’t want to carry four bags of groceries on a bus, plus on average a couple of times a month you need to transport bulkier items -yes you could rent a car for that each time, but people like ad hoc convenience, they don’t like planning things in advance, if they can avoid it.