Question is, why are any of these lawsuits valid?
"Did you choose a career in professional sports?"..."Well, yes."..."Why?"..."Because I loved the game and got paid a lot."..."Could you have gotten a safer job making less money?"..."Well, yes."..."Were you aware that on occasion, people in your profession suffer injuries during the average work day?"..."Well, yes."..."Were you aware that getting hit in the head over and over again might be a bad thing?"..."It crossed my mind, ya."..."And now you want your employers to reimburse you for your injuries, even though you willingly chose to play this game, knowing injuries were a part of it, so you could make a lot more money than the average person?"..."Something like that."
I don't need a doctor to tell me that certain injuries, activities or professions are dangerous. That's why athletes make big bucks. If they want to be safe, let them go work in an office or at the local McDonald's.