Paul - just look at the road...
There has been one, well published, fatality as a result of a <disable libel legislation>knowingly negligent</libel legislation activated> company disabling safety systems.
Their particular software was also way behind the capabilities of other vendors, and they had decided that they didn't need both a test operator and a safety driver.
How many people have been killed on the roads in the couple of minutes it's taken me to write this comment - it's more than have been killed by even uncertified autonomous systems.
What we don't know is how many people already *haven't* been killed as a result of self driving and/or driver assistance features...
(Yes I know there have been cases of driver assistance programs being blindly trusted to death, but that's different from an actually self driving vehicle.)