Yea so ? Harping on the 2% issues does not negate the benefit you have the rest of the time: It can swerve in microseconds, you cannot. How many times will your nail removal skills save you or your kids live compared to software that knows that rolling the car to the left have a 87.34 better chance of occupants survival that the head-on collision with the truck that just swerved in 0.4 seconds ago ?

Forget it, driver-less s cars will be the norm in the future. You won't be able to afford the insurance associated with a meat-driven car.