Firstly, I recognize this is just one factor. I focused on it because it's one I'm highly familiar with, not because it's the end-all be-all. I've already pointed this out in multiple comments. We could also talk about educational opportunities or tolerance/discrimination, but those things either aren't as clear cut or would be more contentious to discuss.

Americans saying they prefer cars when you ask makes sense when you consider the other options are usually hilariously bad wherever they live, and where they've lived in the past, too. Give them an option where walking and biking and transit actually work, and suddenly many people find those options desirable. Just look at how many American tourists say they love the transit system in, say, Tokyo, when they visit. Americans mostly "love cars" because they've been given no other serious options.

Lastly, while many people may not think of it in explicit terms, they may nonetheless enjoy some of the knock-on effects of urbanism, like a city "feeling more lively".