It may be surprising to you, but I don't drive (I don't live in the US, but even when I did I didn't really have to), and there was a period of time I resorted to not even taking taxis because a crash in those times would have been much messier than just myself dying. But my own private life aside, driving, to many people, is a necessity, sometimes even for survival, while lending a hand to a stranger, however nobel that may be, is not.