Why is it that only "doing nice things" or "volunteering your time" makes you a good person? Does a traffic engineer not better the lives of others? What about a farmer? Where does the food served in a soup kitchen come from if not from the sweat of the farmer's brow? The shelter over everyone's head only exists because truckers transported the materials. Simply existing in a way that isn't purely self-serving is often enough to be hugely helpful to others.