Some people don’t want to take public transportation. I hated taking the train everyday. Sometimes, I drove into the city just to have some peace, and privacy in my car, and not be surrounded by people. Plus, it’s cold or really hot in some places. The hell I look like waiting outside at a station, or riding a bike.
Public Transport is just one aspect(major aspect). You also need to redesign neighborhood so people don't need to get in their cars in the first place. Dense neighborhoods where things we consume everyday are walking distance. The though of getting in car to go to the corner store, dry cleaners, pharmacy, coffee house etc. is just gross.