I've watched this film on Netflix a few times now. The more I see stories like this the more I struggle with the role of the enforcer/fighter in the game.
I grew up watching hockey in the 80s, loved guys like Probert and Kocur but now as an adult hockey fan and knowing what it does to these guys I have a harder time enjoying it as part of the game.
Especially because the more you learn about them you realize what great guys most of them were. Blue collar guys doing what they had to in order to stay on the roster. Saying "they knew what they were getting in to" doesn't really explain it away for me anymore.
As for the documentary, I thought it was a decent one, though completely misnamed. It really is a movie about Nilan.