Maybe me using 'thrown out of the seat" was the wrong phrase. Being slightly jolted where as if wearing a seatbelt would have kept it to a minimum could be a big difference.
I will compromise with you where passengers are concerned. It's very important that they be strapped in to prevent accidents. The driver needs to wear a seat belt to be able to insist that the passengers also wear seat belts.
The law rightfully takes that into account and insists that all in a car must wear seat belts.