People objectively don't want to share space with the masses. Even in Singapore or Japan, the stress of being in crowds is simply not worth it. Its slower, requires far more mental energy to plan your route, and requires a lot of physical movement which is hard for fatass americans.
Especially when America has quite cheap, awesomely fast and fun cars (your local C8 Corvette can be had for 15% off MSRP from the factory right now).
Cars are freedom. Mass transit is biopolitics/biopower. Big ass off road capable trucks literally don't even need roads.