I think the danger is that semi-self-driving with occasional human intervention will be <i>more</i> dangerous than pure human driving. If the interventions are so rare that the average deaths&#x2F;injuries fall below the current level, then of course we&#x27;ve made <i>some</i> progress. But hopefully by this time we&#x27;ll be able to go full-auto. It&#x27;s hard to imagine an extremely unexpected dangerous situation, in which giving control to human would be better than just making the algorithm try and recover.