We can talk about Bill Durnan, Frank McCool or many other goaltenders back in the day who left the game because of behavioral ailments.
But the most direct example I can think of is 1982 playoff hero Mike Moffat, who ultimately left the sport because "at 22, he had had enough - of the pressure, of his inability to adjust to it, most of all the nervous attacks that left him with chronic headaches and perpetual insomnia."
If there'd been public awareness back then (and God forbid a program like Knight was able to take advantage of), perhaps Moffat would have thrived under a pretty solid Bruins defensive system that made goaltenders look pretty nice. As it stands, 95% of the folks reading this are either saying "Mike Moffat who?" or "Well, he couldn't have been that good if he had to quit."
Thank God that we're not in an era where we're just told to pour some Budweiser on it and move forward. "It's all in your head." "Aren't you strong?"
Horseshit.
I'm one of many goaltenders I know that have been diagnosed clinically with obsessive-compulsive disorder. 95% of the time, I'm thinking about literally the worst possible outcome in any situation. Whatever you think I'm thinking about, rest assured that it's worse, and I'm trying to mitigate against it as best I can. It shows up in my work, in my hockey playing, and surely here on HFBoards.
I don't know if the position attracts people likely to have these symptoms - Hirsch and Malarchuk are prominent examples - or if playing the position moves people in this direction - but it happens a lot.
If you think that this is easy to deal with or not a real problem, go away. Your opinion means squat zero.