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.
That is not the entire point of SCOTUS. That is not even in the constitution; it is a power the court gave itself in Marbury v. Madison.
Most SCOTUS decisions are judging appeals against federal law (including the constitution). Occasionally they rule a federal law unconstitutional, but not usually.