That is because there is no effective alternatives to a car in most of the world, particularly the US. Far less need for a car in many European cities–because they have a good non-car transit system.
Actually, the privately owned car is mainly a status symbol in most of the world. As you pointed out, there is diminished requirement of a car for both inter city and intra city transportation in Euro. But this is also true in most Asian countries (the speed and efficiency of Japanese and Chinese “bullet” trains is famous. Even in poorer countries, like India or Indonesia or the Philippines, the use of taxis and similar ride-share vehicles (jeepnies, mini-buses, etc.) is ubiquitous.
We, in the US have, under the incessant marketing of the automotive, petroleum, tire companies, as well as automobile manufacturing and teamster unions, have for over six decades been deemphasizing our light-rail intra-city and railroad inter-city transport systems. We, as a society, have, once more, taken a unique direction which few other countries have elected to copy. As a view of China’s solution demonstrates, our explanation of physical size of country, number of people traveling, large cities, etc. are simply rationalizations of our irrational world-view.
Jeff
(Who frequently opts for the train abroad and uses mass transit both abroad and at home within cities where that is realist - sorry LA -, but still flies in thee US over distances where the train would be preferable, but would be faced with a lack of an economic solution at the far-end train station).