At my local supermarket it has about 30-40 disabled parking bays and about 20 parent and child. A minority of disabled people regularly park in the parent and child bays even though theirs always plenty of disabled bays free.
Us parent's are not allowed to park in disabled bays ( Rightly so ) and It really annoys me a minority of disabled people abuse the system like that.
If 99% of disabled bays are full I'd happily give my parent and child bay up, It's right that they should have priority if the disabled bays are full, But should show some courtesy towards others and try to use the disabled bays as provided so us parents can use the facilities.
Please understand I'm not having a dig at disabled people, Some of my family are disabled and many do use the facilities correctly.