The period of 'we know, but we're not telling' is gone. If you want to harp on a time when management purposely let the players risk permanent damage, unknowingly, there are probably very few here who would argue the point. There was also the same sort of period for asbestos, smoking, radium watches and probably a lot of others. Far enough back, nobody knew there was danger, and hence nobody was really to blame. Now, there's no question of the danger, and safeguards are in place. Somewhere in between, the dangers started to surface and were most likely ignored by those making a profit. So, how does affect the present?
And, don't forget that the reason there are 2600 guys looking to make a team every year is because they WANT to, for money, fame, love of the game, whatever. In just the last year or two, more have opted out prematurely than ever before. That's an option, and it always has been. And, money may be as important as a normal life for guys who otherwise are looking at really poor alternatives.