It wont be banned, it will just cost much more to insure (since it will be directly tied to risk, computers already drive better than humans). If you drive manually, you will need to pay for the privilege.
I think the comparison is made over the entire range of situations.
If we can get rid of, or vastly reduce, the problems of inattention, exhaustion, rage, chemical impairments and the like, we have a huge improvement. I think that improvement is vastly more, cost measured in human life, than the problems we see with computer control in odd situations.
So yes. They do drive better than humans. The fact that their failings are wack-doodle to us (you drove _right_ into that truck??) is swallowed in the fact that their failings are profoundly fewer than ours.
They do not! Are you comparing computer driving in "easy" situations with human driving in all situations?