Not everyone can drive. Most of those who can't drive also cannot afford a taxi or rideshare. Many of them also do not have friends or family who can get them where they need to go, and reliance on others is extremely demoralizing to independence.
That says nothing of the carbon cost in fuel, the microparticle cost in tire and brake dust, or other inflated pollutants.
The U.S.'s car-dominant infrastructure is a tragedy.