You can say that the players know about the risks and continue to play anyhow, but there's been some new research in the last couple of years that shows how damaging repeated blows to the head are for long-term neurological health, none of which was known to players or physicians of NFL teams before - which kinda nullifies your argument that they know the situation completely and accept the risks.
Not to mention that if you're payed millions of dollars, professional players are pushed to play harder than they should by team owners and management, which impedes personal discretion.
Pussification involves men's fashion being dictated by gay designers in Paris, or men constantly deferring to their wives' wishes, like not allowing them to stand while taking a leak. Relationships are built upon mutual respect and certainly I'm not saying that men should never listen to their wives, but the battering of Man's ego and virility to the point where the wife controls the man (ie, numerous Super Bowl ads alluded to this) isn't funny, it's pathetic and bad for our society.
This, on the other hand, is based on medical research and might be necessary to prevent silent, long-term injury to thousands of players.
I hope they can keep things as they are... maybe they need to invest in better helmet technology. I've read before that MLB batting helmets have come a long way, but players still prefer the older, less dorky-looking versions even though the new helmets are safer. That is indeed a personal acceptance of risk, but in the NFL I dont think it's quiet the same just yet.
Just my two cents.
