Okay, so MOST aren't driving themselves. Personally, I don't buy it, but lets say that's correct just for the sake of argument.
So if they aren't driving themselves, and can't help themselves, that means somebody else is. So the guy that mentioned above about his son, you really expect him to park in the middle of the "unloading zone" while potentially blocking traffic, to "unload" his son, in front of everyone, then leave his son there, and go find a parking spot? I'm sure its comforting for the driver to just leave someone, often times their child, sitting in their wheelchair by themselves unwatched. That makes absolutely no sense.
Give them a parking spot that is close, so they can properly handle the difficulties they often times can't help in the first place.