I have lost count of the number of people who have told me (especially in France and Germany) that Diana Princess of Wales was killed by secret services, completely ignoring the fact that if she put her bloody seat belt on she would have had no more than a sore neck and bruising.
It is common practice for celebrities NOT to wear seat belts at the behest of their body guards, one of whom was in the car with Diana. The reasons for this override the increased risk of injury in a road traffic accident.
She was the victim of an impaired (drunk) driver, driving beyond his abilities into a fairly dangerous part of the peripherique. Those tunnel supports make very poor crash barriers.
Cheers
Steve