1) Not filtering out drunk drivers is downright misleading. I am less interested in "is mandatory self-driving safer than human drivers?" than "is mandatory self-driving safer than mandatory breathalyzer ignition?" There are some uniquely human downsides which are fair comparisons to AI - distractions, slowness, anger -but drunk drivers should be removed from this.

2) The bigger problem is people rationally speeding or running red lights. Waymo is strictly legal, but Tesla self-driving historically encouraged speeding, rolling stop signs, etc. Ubers and Lyft are preferred if you're in a hurry precisely because human drivers bend the law. Human speeding is not caused by a lack of intelligence and needing an AI to figure it out that it's dangerous: humans do it because they are selfish and reckless, and someone like Tesla will make a driving AI that fulfills their selfish demands. There is absolutely no reason to think that a speeding Waymo would be safer than a speeding human.

Studies like this makes me worry about a medium-term where driving is more dangerous for everyone: lawful drivers get in more accidents because they're using sub-human AI, whereas nothing changes for unlawful drivers because they are using dangerous AI, turning off the AI and driving drunk, etc.