Ok, imagine if you are a passenger in a car, sitting next to the driver. You are heading towards a turn, with a solid barrier in your path if you don't turn. Your driver is awake, holding the wheel firmly with eyes wide open. Do you think there's any chance you could intervene between realizing that the driver is not turning and the car hitting the barrier? You could be paying 200% attention to the road, but there's just not enough time - by the time you even realize that the driver is not turning the wheel to impact there is like 1 second of time, maybe two - could you grab the wheel and pull it to one side in that time? And even if you could, can you guarantee that you won't pull it too much and into the path of fully loaded 18-wheeler which will promptly flatten your car?

It's just not good enough. Semi-autonomous cars can't be hitting stationary objects without reacting at all. If they fail at this basic task, then they shouldn't be allowed on the road.