> leads me to believe that such cars had negligently insecure encryption
While accurate, the standard may not be as rigorous as you'd like to imagine; there was a time not long ago when a wire coat hanger was enough to unlock a car.
I remember that time. We even used it once on a friend's car. However, we did not ban wire coat hangers. I'm sure the politicians would agree that would have been silly, but common sense seems to leave them when it comes to tech.
