It's tragic, but not unheard of in small towns. My family is from a small town of similar size. There, it was often a ritual to pile-into a car or pickup truck at lunchtime to go anywhere but the campus for lunch. Small towns can have what may be a false sense of safety. So, seat belt laws may be ignored (no rear seat belt law for passengers over 7 years old in OK) and common sense flies to the wind for "just a quick run" for fast food. "These crashes are things that happen elsewhere, never to me..." Kids die in crashes all the time; I think we're reading about it only because so many died in a single accident.
I despise government over-reach, but some laws are good. For example, young drivers in Virginia are not allowed more than one passenger, except for family members. My daughter knew to never violate this since the consequences from me could be steep. She still managed to total a new-ish Jetta when she was almost 18, completely her fault. She was fine, as were the other cars involved. Had that not been the case, at least she wouldn't have taken-out a bunch of friends with her.
I can see and imagine what went wrong at that intersection. It's easy to assume, perhaps incorrectly, that the very young driver of the car pulled out in front of a truck that couldn't stop. Those close to victims seldom want to admit fault. The small town from my youth had a brother and sister die when they rear-ended a school bus that was turning left. Apparently, the vehicle in front of them saw the bus, moved to the right lane to pass, and the kids didn't react soon enough, probably because they were either talking or following too closely for 70 mph. It was very much their fault, but no one was allowed to say it. Back to this story, the driver of the rock truck will be scrutinized for a long time, may lose his job, and will likely be in and out of court, even if charges are never filed. And that doesn't even consider his own emotional trauma. He'll be totally screwed if it comes out that he was even barely exceeding the 50 mph speed limit there. Commercial drivers often get nailed with full fault if even one thing is not quite right.
I hope they post a follow-up. Something tells me they won't update if the girl was at fault.