How do you know there was no other car involved? True, there wasn't a collision with another car, but there were no witnesses and the driver very well could have been reacting to another driver on the road (or an animal, or there was mechanical failure, or...) CAUSING him to lose control.

Racecar drivers are driving meticulously cared for high-performance cars on a closed, carefully maintained, well-lit and predictable track. Completely different situation from a typcial person driving a typical car on a typical road.

A little dignity, please! You can say how important it is to wear a seatbelt without being disrespectful to a deceased person and his family.