Our public transit systems are largely garbage, if they exist at all. Bike lanes are extremely rare, and are really just used as free car parking.
Take my commute to work for instance. It's about 3 miles, but it would be impossible to bike, as there are huge and dangerous hills. Likewise, walking would be very difficult. It takes about 10 minutes to drive to work, and a bus would be over 40 minutes.
We have major infrastructural failures that make it very impractical to exist without a car in most cases.