My wife is the opposite of your source of irritation. She is fully paralyzed on the left side from a stroke. She walks with a cane (with great difficulty, and not really well) and absolutely refuses to be wheeled into a plane. As a very experienced victim of a serious disability, she would give you a knowing nod, regarding your rant. Yes, there are lot of folks who have no visible disability and a genuine need for mobility assistance. Unfortunately, there are a ton that also have no real need and play the game. Her favorite are the "big girls" who seem to have no issue with smoothly and quickly exiting their vehicles, and walk with no problem to the entrance to the grocery store. Next they beach themselves on a scooter. After shopping, usually with little regard for any other other human in the place, they invariable park the thing next to their car door, load there stuff, and drive away. Not a single fuck is given about the fact that it needs to be returned to where they found it, and plugged into the wall for the next legitimate user. The sweetest is when they have just plopped on the scooter to start their Jabba the Hutt tour, and make eye contact with the wife. If they are just lazy bastards, they usually turn red, and quickly offer up their ride. She politely refuses, but they know that they have been outed.