So when do you think they should have stopped?

We had a 02, 1500 Dodge pickup towed in that lost it's passanger side wheel.Well it lost more than that. There weren't any wheel bearings left at all, the spindle was worn almost in two. When the wheel finally let go it also bent the upper and lower control arms. The owner said it never made any noise just fell off.Looking at the tire(negitive camber to the cords) he had to have driven it for days or even weeks like that.
I also worked for a company that had front wheel drive salesmen cars.Had one salesman drive in and park, went inside never said a word. I went in and said "Paul is there something wrong with your car?" "No I don't think so ?" was his answer.There was no tire on the driver side rear, just a rim and not much of it.Same thing,, never heard nothing. I guess he never looks in the rear view mirror much.