Drivers have a lot to think about. Let them concentrate on driving.
Distractions - like loud voices, questions, moving around - can cause mistakes and accidents. Be calm and considerate yourself, and encourage others in the car to do the same. It’s safer for everybody.
If the car is stopped by police and people aren’t wearing their seatbelts, the driver will be fined, and could lose their licence. Worse, if there’s an accident the chance of being badly hurt is much more for people not wearing seatbelts.
Be the best passenger you can be.