I agree, people fall asleep (or worse) at the wheel, every day. The vast majority of those people don't die or even crash. So what I take issue with is this:
> but all things equal, a driver who does this will fare better with Autopilot than without it.
There's no science or evidence for this yet. Tesla has had the opportunity to release data but has declined, to the point where the NHTSA had to disown a misleading stat that Tesla kept citing in the wake of recent crashes:
https://www.wired.com/story/tesla-autopilot-safety-statistic...
It's not that I have an inherent distrust of automation (being a computer engineer myself), so I don't have a problem with AutoPilot in theory, and I can accept that AP may be better than its current peers. But what Tesla has presented, in lieu of studies and statistics, is a non-falsifiable claim: that AutoPilot increases safety.
We already have well-known examples of AP actively steering off the roads, because of ambiguous road paint. But besides those (perhaps relatively few) incidents in which AP arguably caused the crash, we have many instances where AP didn't prevent what seems like easily preventable crashes. Such as the Utah driver who drove 60mph into a parked fire truck. In those cases, I would agree that the driver was an idiot, but the question for overall safety is: does AP result in a net increase of accidents because drivers are too over-confident?
In the tweet that I mentioned, that's a guy who clearly has the means to call an Uber. Would he have attempted to drive himself if he didn't have Autopilot? Did AP make it easier for him to doze off? I've had a few instances of highway sleepy driving -- thankfully, the feedback from rumble strips or the rough shoulder was enough to jolt adrenaline in me, and get me to pull off at the next rest stop. AP's advantage seems to be that it will just stay within the lane as you sleep. But there's really no evidence that results in a net increase in safety, if Autopilot emboldens drivers who would've otherwise not tried to drive.
The main difference between AP and other safety measures is that, based on Tesla's defenses so far, there is literally no situation in which AP should be assigned blame, because it's ultimately the driver's responsibility. Whereas when an airbag fails to deploy, or just randomly blows up in a driver's face, there can be agreement that the airbag "failed".