I really wonder what's the point of even asking the AP question after someone has just gotten into an accident. In that moment they're dazed, confused, and likely angry.
In any case this kind of thing is why we can't have nice things.
Here is a 58 year old adult with likely decades of driving experience. Despite that he got himself into an easily preventable accident.
AP can't be blamed for the accident, but it's likely the existence of it played a role.
Why'd he engage it right before coming up to an intersection with a major left hand turn?
Why'd he use the throttle? Was it trying to slow down (TACC slows down for corners) and he overrode it?
So it becomes this ridiculous accident, and as a result our insurance rates go up. So far I've seen dumb accident after dumb accident when it comes Tesla drivers.
It's a boneheadedly simple mechanism. You engage TACC/AP, and it accelerates up to the set point. In certain situations this isn't what you want so leave it off, or hit the brakes when it does.