Elaine-I would be sick about it, too. The baby quilt I made for my first grandson was washed in bleach by his daddy. I don't have to tell you how it looks now, you get the picture. After being angry for a long time, I decided it would be better for "me" to focus on the enjoyment I had thinking about my future grandson (the "joy" of the process) and the wonderful feeling of accomplishment. Once it leaves my hands, I've decdided that I am no longer the owner and not responsible. I would hope my quilts would get tender, loving care but I can't ever guarantee they will. No, I would not repair it.
I know he's your son and you still love him very much. I did make a second quilt for my grandson and gave specific care instructions. But, just remember making it is the "pay-off" or pleasure for you not checking in years (or months) later to see how it's holding up.
It was a very hard lesson for me to learn.....