Here is an example:
Isabel has severe pain and fatigue.
Jane uses a manual folding wheelchair.
Kate uses a powered wheelchair.
All three women have a BB - everyone has an equal right to the BB space. None of them would be wrong to park in it, and none of them should feel guilty or at fault. But the impact of not having the space would be different for each:
Isabel has greatly increased pain and fatigue.
Jane has difficulty getting her chair out, it is less safe for her, and she has to cross a dangerous car park.
Kate cannot exit her vehicle, and must go home.
My point is that if you get twenty more Isabels, then without any of them ever doing anything wrong at an individual level, the impact on Kate is going to be very significant. And that doesn’t even consider all the other types of people (including healthy, abled Mary, who is just popping in…).
It isn't the responsibility of any of the women to fix. But it is still a genuine problem and it isn't honest or fair to try to stifle discussion.