An addiction to amphetamines doesn't seem surprising at all to me. One of the most commonly prescribed amphetamines is Ritalin. Half the world seems to take Ritalin these days, and I could definitely see how someone who suffered brain damage could be classified as having attention-deficit disorder among many other issues!
It seems to me that more than one NFL player/ex player has become addicted to one form of drug or another related to their injuries -- didn't Farve have a pain killer addiction at one point? I don't see anyone thinking Farve's a pathetic druggie because of that.
I think this story is very sad. I don't like seeing Ted Johnson dragging the Pats/Belichick through the mud, but I also think he thought long and hard about it before doing so. In the article I read in the Boston Globe, the reporter said that Ted had initially told him the story last summer and then changed his mind and asked him not to run it. He said that the suicide of Andre Waters a couple of months ago caused Ted to change his mind again and want his story out there.
It does seem like a disproportionate amount of ex-NFL players have serious mental instability issues and other problems. The whole culture of the game is for people to play despite the fact that their body parts are hanging off. Players are going to want to play no matter what because they know their jobs are on the line. I do think that coaches and trainers need to do all they can to help protect these guys (especially with head injuries), and I do also think it is important for players to look out for themselves. If getting this story out there can change anything for the better, then it's a good thing.