Tesla's "Full Self Driving" mode requires the driver to pay attention the entire time
This is a BS excuse. You can't expect most human beings to fully alert at all time when they don't have to actively need to do something for most of the time. There are several studies that prove the situational awareness always drops over time in Level 3 and Level 4 self driving vehicles.
The drivers only real fault is activating the self-driving in the first place. The attention requirement only exists to protect Tesla's bank accounts.