I think that was parent's point. If the mirrors are misaligned, a driver might think that an obstacle was at 10 o'clock, when it was actually at 11 o'clock causing a collision.
However, I don't think that this would be an impediment to put this into cars. In the past 10 years, there's been a proliferation of driver assist capabilities like backup cameras, radar collision detection, etc. All of which, should a 'misalignment' occur, could result in the driver having an accident and we haven't seen a barrage of lawsuits.