The question isn't "are they safer than the average human driver?"
The question is "who goes to prison when that self driving car has an oopsie, veers across three lanes of traffic and wipes out a family of four?"
Because if the answer is "nobody", they shouldn't be on the road. There's zero accountability, and because it's all wibbly-wobbly AI bullshit, there's no way to prove that the issues are actually fixed.