Because door-to-door transport is faster than public transportation. Average American commute time is 26 minutes, what is it where you live?
https://transportgeography.org/contents/chapter8/urban-trans....
https://transportgeography.org/contents/chapter8/urban-trans....
In BCN for example commute would be most of the time ~15-20 minutes (walking+metro). Car would easily take twice as much.
Of course if you are living in urban sprawl and nothing is close and even getting something to eat requires "a trip" then yeah - door-to-door car would probably be "better"
Edit: also, the chart is too simple to know how they conducted and came up with the data.
Not sure there's just one right way to live though. I wasn't saying there is, just sharing some data to a discussion oblivious to the realities of most Americans.