It makes sense because holding users personally responsible for the inadequacies of self-driving products externalizes all the risk for companies selling self-driving systems. The Uber system detected something in the road and proceeded because it did not recognize it. That's how it is designed. Otherwise the car would never go very far without stopping because the system does not recognize most things it detects.

To put it another way, the self-driving system did not alert the driver that it had detected something and did not know what it was. It wasn't an emergency, it was the car's normal operation.