I had a friend roll his car recently, and he wasn’t wearing a seat belt. He was immediately ejected from the car. The fireman on scene said had he been wearing his seat belt, he would most certainly have died. But we don’t hear these stories.
I lived through that type of accident. My vehicle hit an embankment before rolling. The engine came into the cab of the pickup. If I would have been in a seatbelt, the steering wheel would have crushed my chest, killing me. The engine would have taken my legs.
Instead, I actually walked away from the accident with “minor” injuries (literally walked away, I had to walk for help).