Similarly, you and I are both forced to share the roads with folks who are impaired in various ways, whether it's declining reflexes, vision, cognitive function - or just straight up drunk driving. As somebody who comes from a country with very strict anti drunk-driving rules (checkpoints randomly on commonly used roads frequently enough to deter it), it blows my mind that I have to share the roads in the US with drivers who think having "just 4 beers" before their 45 minute drive home is fine.
Since the US hasn't shown many signs for cracking down on drunk driving, and adding better infrastructure for folks who can no longer drive for various reasons is equally a non-starter at the moment - I'm all in favor of any system that speeds up the arrival of genuinely fully autonomous driving. Tesla hasn't killed or injured anyone using this "FSD beta" program to date, despite a large number of miles driven, so their existing precautions appear to be working.
Even in the interim, before we reach fully autonomous driving, "better than the average human driver" is still a huge performance milestone worth aiming for before we start obsessing over "perfect" (Not saying FSD Beta is there yet, but Autopilot on Highways might be).