Oopsie. This strikes me as perhaps one of the growing pains of not-quite-self-driving: common sense would dictate that manual control would be taken by the driver when approaching an unusual situation like a roadside incident, but we just can't trust the common sense of a minority of people.
Tesla perhaps isn't being loud enough about how autopilot isn't self-driving, and shouldn't even be relied upon to hit the brakes when something is in front of you.