In this one specific case sure, the AP was confused about the lane markings and followed the wrong path. But in plenty of other cases the AP is responsible for

In this one specific case sure, the AP was confused about the lane markings and followed the wrong path. But in plenty of other cases the AP is responsible for preventing accidents (no, I have no link to back up my statement). Assuming that is the case, then that is what I would describe as reducing the likelihood of accidents. You cannot focus on a specific accident (or even a handful of accidents) and use that to refute the systemic benefits.