That may be true, but I believe the point is not that the Truck-driver couldn't do more (Sure, he could.. Switching to a car would be better), but to show that

That may be true, but I believe the point is not that the Truck-driver couldn't do more (Sure, he could.. Switching to a car would be better), but to show that the car owner was not considering things logically and considering that the ramifications of her own choices.