More and more evidence comes out showing that cte type damage starts when players are young. I wouldn't let my kids play, that's for sure. It's one thing to punish your body, it's quite another to lose your mind.
Not sure how that could possibly be proven, since you can't even diagnose CTE until you examine the brain after death.
Most of these guys have said they accept the long-term health risks in exchange for playing football. That's how much they love playing the game.
And that should be the long and short of it. Make players aware of the risks, and they can choose to play the game or not. No one is making anyone play football. Instead, the ninnies of society have to step in and protect people from themselves. Let people make their own decisions on whether or not to play and stay the hell out of it and quit changing the game to make it "safe".
Football isn't safe. That's why it's been popular for over 100 years.