Liability of an accident doesn't factor into those statistics. They include all accidents regardless of blame.
And you act like that exact scenario hasn't happened with human drivers. In Arizona alone, 3.5 people die every day in traffic incidents. Given the number of dumb fuck road ragers brake checking other drivers on the road, stopping in the middle of an intersection and getting hit probably happens at least once a day, probably more.
Yet even with all those fatalities, and other accidents in general, the autonomous systems still have fewer incidents per mile driven.
They already are, the media just reports on every one of these crashes. Even just reporting on each human fatality daily would put things closer to perspective even with every autonomous accident being reported as if it were the end times.