At some point we have to accept vehicular deaths given how car-centric our society is and how distracted and unsafe a lot of drivers have become.
Normal taxi drivers kill people.
Normal truck drivers kill people.
Normal home to work drivers kill people.
If a robotic taxi can lower the taxi category of accidents by 91% across the board, including death rates, then that's a positive improvement to society any way you slice it. Not saying it isn't a horrifying dystopian world we're potentially building, but at the moment, given the numbers, it would be 91% safer in that category.
The ultimate solution is to shift towards more public transit options in general, and away from individual vehicular transport. Not only is it a massive burden to the environment, but it's a massive cost burden to the individuals and society as a whole.