Subsidies played a huge role, including the eminent domain bulldozing of cities for free-at-use highways. If people had to pay upfront for those costs, the urban landscape would look much different (probably closer to Japanese cities, which do have massive suburbs, but centred around train stations).
Yet Japan does still have cars (and a car culture even), they're just not necessarily the default or dominant mode of transport.
Sure, nobody is saying cars are useless or unfun, I'm just pushing back against the idea that everything car everywhere is a natural and intrinsic outcome from cars existing. As I noted, even in the netherlands cars are common, the dutch have a very dense road network, and a fair amount of cars.
I think we're on the same page.
For me, cars are a perfectly fine mode of transport, but the way so many places prioritize it over alternatives (whatever the reason) isn't necessarily better.
My "wtf" moment was 20 years ago when I was visiting my cousin in an exurb and we sat in a line of cars for over 40 minutes waiting for our turn to pick up her kid. The messed up part was that while there were school busses, everything was so spread out that the bus ride for them would have been over an hour and then another 20 minute walk from the arterial road drop-off point to their house. Everything was far away, including local public parks.