They also put a distracting video monitor in front of the driver 100% of the time, not just the 0.2% while backing. Manufacturers have moved a lot of controls to that screen, rather than leaving them on tactile buttons and switches that could be operated without taking eyes off the road.
How many collisions have been caused by distractions from the these screens?
Unless they only permitted that screen to show a rear view. They could have prohibited any other use, or prohibited non-tactile controls that required ocular attention while driving. They could have required that touchscreen controls be disabled while driving. But they didn't.
They mandated the distracting screen, and probably killed more people than they saved.