Lots of people who have had a stroke and should absolutely not be driving are still driving.
Because in America telling old people they can't drive is basically telling them to sit at home die sad and lonely. Or worse, move out of their status symbol suburban homes to which they have tied their entire self worth.
They probably know that if they put corn starch on Stonehenge they'll be in jail for a few days and get community service, but if they put spray paint on a billionaire's yacht, they'd get shot.