Here's an interesting take by former NHL'er Chris 'Knuckles' Nilan...
Points out how his depression didn't come from the game, or the fighting - it came from substance abuse.
This is all I have to say about the subject. I love the fights, not the staged kind. And, I think Yzerman is wrong and should be more concerned about his team than fighting.
I'm really indifferent to the 'staged' fights, but IMHO there's nothing better than those 'heat of the moment' scraps between players who've been battling hard the entire night, and wish to 'vent'.