Europeans tend to have cities that have been around much longer than cars have, and you can see it in the design - they were built back when horses were the fastest mode of transportation.
Many small American towns were built after the introduction of the automobile (or at least significant chucks of the towns were).
Trying to undo history, or even taking a new mode of design is extraordinarily difficult. The discussion threads on this post seems to highlight that difficulty, while many miss that root cause.
The really bad stuff only really started coming out after we got zoning and then accelerated with post WWII development.
Can we make something just as walkable and nice as those Italian cities? Maybe not, but we can certainly walk back some of the worst excesses of the late 20th century.
This site has a lot of ideas and discussion: https://www.strongtowns.org/
Oh, and it also turns out that much of suburbia is not very sustainable financially, and nor is it great for the environment.
But I bet almost everybody has a car.
Can we "fix" cities to be more functional in a world dominated by autos?
I wonder if we can. It seems like inertia has become so great that it will take many decades to overcome this. In Houston, I think this easily could take 1/2 a century or more.And yes, it was walkable, because things were close to one another.
"The best time to plant a tree was 20 years ago. The second best time is now."
With modern levels of obesity and pollution, why don’t we want walkable cities?