There are still genuine uses for cars, and I doubt OP would disagree. But in urban areas your example situations aren't relevant. The point is that cars are inefficient in most if not all urban cases.
The anti-car brigade's argument always hinges on assuming everyone lives in urban areas, and only has to go to urban areas. If you constrain the problem space that much, then yea, nobody needs cars. In the rest of the universe, they are indispensable.
