You mean it would disable FSD when it would see that impact was inevitable so Tesla could claim that FSD had nothing to do with the accident.
I know this was just an example scenario and your point is broader, but I'm struggling to think of another circumstance where autopilot is at fault 30 seconds post disengage, as it's effectively just a fancy adaptive cruise control.
I've never been at an intersection where straight ahead is a wrong way (wouldn't the traffic be then facing you?), but like any cruise control system, it would likely require driver attention.
Autopilot is not intended to be enable and go to sleep. It's simply fancy cruise control.