Exposition - Should 7 year olds have to sit in a booster seat?

I believe that children at 7 years should sit in a booster seat.

Firstly, children would have a greater chance to fly out of the window. Secondly, the seatbelt can cut the child's neck. Finally, it is safe for children to sit in a booster seat.

Children at 7 years should sit in a booster seat because it is safe for children.