[avianlyric]

Seatbelts also protect other car occupants. When your car goes from 80mph to 0mph, if you’re not wearing a seatbelt, you become a 80kg, 80mph meat missile bouncing around the car.

If someone else happens to be in that car with you. Then it very likely you’re gonna kill them. If multiple people are not wearing a seatbelt, then the problems only escalates from there.

Sitting in the back doesn’t changes the dynamics much either. Car seats aren’t designed to withstand a 60+kg mass hitting them from behind at 80mph. They fold flat, and anyone still sitting in them gets folded flat at well, and that’s all before you start worrying about what happens when two skulls collide at 30-100mph.

[WalterBright]

I'm aware of that, and when I drive I require that all my passengers buckle up.