Yeah, I know most Americans do not want to hear this.
You are required to wear seat belts, in part because of the potential for brain injury sustained from a crash.
Football helmets do not provide adequate protection during football games OR practices.
There are lots of alternative sports without the same high potential for brain injury.
Hundreds of professional football players (and their doctors and lawyers) are certain that the players’ current cognitive and motor problems were caused by playing football: they are suing for hundreds of millions of dollars.
Don’t quote the Constitution to me like you do when rational people want to control the sale of guns. The Constitution does not guarantee you the right to kill yourself or your children or your peers by playing a team sport.
A few more arguments …