Proven where?
I would think that it is obvious that something to diffuse a blow to the head would help prevent injury.
http://www.injuryresearch.bc.ca/Publ...ct%20sheet.pdf
"Helmets and face shields are proven to significantly reduce head and face injuries..."
As someone who continues to play the sport of hockey, I trust the helmet to do its job (and the only injuries I have sustained are cuts to the face, lacerated spleen, and a knee injury) and I wouldn't play hockey without one.
Anyways on topic: I really haven't cared for football since the Pats lost in 2008. My home team (Lions) has never been good since I've been alive so I really couldn't care less.