Actually, we had a fatality on the Trans Canada last week, the trucker was ejected from the cab, died on the highway. The highway was closed for 5 hours. Seatbelt, no fatality, the highway would have been open within the hour. There was no bypass, summer traffic was backed up for miles.
Accident, severity of the injury, guaranteed the guy without a seatbelt will suffer far worse injuries. More time in the hospital, a drain on medical personnel and services, maybe rehab, change of career, now in need of handicapped services. Some of the seatbelt legislation is driven by insurance companies to reduce what they send on claims. So yes, it hurts, impedes society and raise your insurance premiums when I don't wear a seatbelt.