"Yet the DMV continues to issue him a license, and he has insurance."
In Florida older drivers are required to take a test which includes not only eyesight evaluation but an actual drivers test. This is all well and good however, if the driver fails, he or she is issued a temporary permit in order to continue driving and has 90 days to take another test. If the driver fails again they are eligible to apply for another temporary license to retake again. I knew an old lady with dementia who drove for 3 years on a temporary license. She could never pass the drivers test, no problem she continued to drive until her 85 year old husband hit her and she died. Guess he got tired of her nagging. He was not charged as he had dementia as well. This was in Sarasota.
Moral of the story, be careful driving on the west coast between St. Pete and Sarasota County!