Why would you adjust your rear view mirror to look in the eyes of the driver behind? You want to see where their car is, and about 90% of their car is below their eye level, so it makes sense that you would see the mouth of the driver in front when you look into their mirror rather than their eyes.
not really? If all you can see from behind is their mouth then they must be looking at the back seats of their car rather than out the back window?
