Scarier thought are driverless semi trailer trucks. What if a big moth hits the camera lens. Does it hit the brakes?
If you break the windscreen in one of the auto braking cars, like Subaru. You have to have a genuine windscreen fitted and the cameras calibrated.
I remember a funny story years ago, someone rented a motor-home with cruise control. So he set it, and went in the back to make a cup of coffee. He hit a tree, and successfully sued the company for not explaining it properly.
JD