I have a car, it's a useful tool on occasion, even with the cost of insurance, fuel, and the modest purchase price, it is still a viable option for me when compared to the costs of hailing a taxi, or the expense and time needed in renting a car.
Though I still use a car every so often, I haven't driven into work in over a decade. I generally leave my co-workers and friends alone about their driving, in what type of vehicle they drive or how short a distance they may travel when driving.