Direct hits II

More on football-related injuries: There's a story, reported by ESPN and others, about Ted Johnson, formerly of the Patriots. He says his depression and other problems stem from game-induced concussions. He has an addiction, and doctors say he's showing early signs of Alzheimer's. He is just 34.
What do you think? Should the league be held responsible for this sort of thing? Of course there's personal responsibility, too (take yourself out of the game if you're not well, as one official says in the story); but the cursory view I have of the game is that players play through pain — you're not "manly" if you sit on the sidelines.
The full story: espn.com