I can't count the number of times I saw a car whip into a blue spot, and a student or two leap out of it and run at full tilt across campus. (Yes, I reported it, every time.) So, under some circumstances, it may be appropriate to kick-up a fuss about it.
if I've a reasonable idea that someone's abusing the system (such as sprinting cross-campus as I describe above -- not simply walking twenty or even a hundred meters
I do believe I've a right to question to myself, and to ask Parking Enforcement to verify.
it's only reasonable to expect that one's going to be asked to verify that they and the entitlement-holder are one and the same
I don't know about the E.U, perhaps people are more respectful of the system
why they use a wheelchair is none of your business.