BAD Drivers are BAD drivers, with or with out a licence.

The blue tag may not have even belonged to the driver of the car. People are not 'handicapped' in their driving either. When I take my Mom, in Oregon, to the Dr. it allows us to park close so she won't have to walk far. She doesn't even know how to drive.
Some of the worst drivers I've seen have no 'blue' tag hanging in their car.