The danger in this contrived scenario is still the human driver, who is distracted and careening down the road.
If all the cars were autonomous, it would more likely to be a matter of frustration than safety: the gnome causes a traffic jam because the cars won't endanger the passenger by driving into the opposing lane. Then what? They find an alternate route? They automatically call in a service crew to clear the road? Not the end of the world.
If all the cars were autonomous, it would more likely to be a matter of frustration than safety: the gnome causes a traffic jam because the cars won't endanger the passenger by driving into the opposing lane. Then what? They find an alternate route? They automatically call in a service crew to clear the road? Not the end of the world.