Able bodied citizens who rent accessible cabins just for the space should be booted from that room in the event that someone who truly needs it attempts to book a space.
When I see perfectly healthy people utilizing accessible facilities instead of leaving it alone for those who truly need it, it really bugs me. I've seen people put a handicapped sign in their car, leap out of the car and almost run into a store. Sorry, but they could have walked a few more feet. Meanwhile, some little old lady is hobbling by who doesn't have that little blue sign. Makes me mad.
My one exception is that there have been a few times when I used a bigger bathroom in a truck stop on roadtrips when I've had the baby and my son with me and needed to make sure no one snuck away while I was peeing. And that still bugged my conscience.