its easy to call it "a mans game" when you're watching from home. But 20 years down the line, when these guys can't walk, have early onset dementia (Brian Westbrook is experiencing it now), ect....is it ever worth it? Like it was mentioned earlier, 30 years ago it was legal to clothesline guys, they banned it, and we havent missed it since.
And once again, running with your head down, leading with the crown of your helmet is not a fundamental of football. you're taught to run with eyes up, and you can lower your shoulder and keep your eyes up.
And also, the fact that the fans want to see it, doesnt negate the right to a decent quality of life after football that these guys deserve. If you voluntarily signed your kids up for football, would you teach them to run like that?