Your right, there is nothing you can do. When i started dating my exabf, he had no insurance for i don't know how long. It made me so mad but that was his problem, not mine.
My friend that lost his license, his wife (my bestfriend) washed her hands of it, he gets rides from whom ever, she's detached herself from his problem. I know your probably very concerned as a mother as i would be too.
Just remember the 3 C's -
You didn't cause it
You can't control it
You can't cure it
big hugs to you...