[QUOTE=commasense]
SNIP
But your claim that “You can not see either outside rear corner of the car AT ALL from the rearview mirror,” is simply and flatly wrong in the case of many, many cars.
[/QUOTE]
Mrs. Slant rented a late-model Pontiac Grand Prix a couple of years ago for a road trip. The thing really, really, had invisible corners.
Edit:
Safety advice and public policy have to be based on the lowest common denominator, not the best case scenario.