It’s that last possibility that’s horrifying above all others. The backlash either way is going to be terrible, but if these cars are just not up to the task at all, and have driven millions of miles on public roads... people will lose their minds. Self-driving tech will be banned for a very long time, public trust will go with it, and I can’t imagine when it would return.
This is going to sound bad, but I hope this is just Uber’s usual criminal incompetence and dishonesty, and not a broader problem with the technology. Of the possible outcomes, that would be the least awful. If it’s just Uber moving fast and killing someone, they’re done (no loss there), but the underlying technology has a future in our lifetimes. If not...