Well, this thread (as I understand it) was specifically created to discuss Hull's legacy on and off the ice, so I think it's quite reasonable that people are discussing Hull's character.
But I agree with you in as much as it's absurd for some people to see things in a black and white binary -- as in: Player X was a POS, but Player Y was wonderful (and then to assume that every reasonable person agrees with his/her standard of that binary).
If we scratch beneath the surface, probably 95% of NHL players have unsavory personal aspects or unsavory past incidents, including the favorite players of everyone on here. But normally we choose to overlook these things, to let the personal be personal, and to focus on the hockey legacy and the more likeable points of a player's public image. (As a good example of this, take my team, Edmonton, and its current popular forward, Evander Kane.)
The "public lynching" thing, as you put it, also happened to Jonathan Toews last year with the Blackhawks' organizational meltdown over the Kyle Beach incident, even though there was no evidence that Toews (six months older than Beach and having never dressed for a single game with him) was aware of the abuse of Beach.
I'd be curious to know what people's standards are on these things, as in, Where do you draw the line? I don't have the answer myself. Like, I can enjoy the music or art of a terrible human being, but there's probably a limit. (If Stalin had been a brilliant artist, I don't want his painting on my wall, regardless.)
I think with high-level pro sports, there's always a problem in trying to appreciate athletes purely as athletes. To celebrate the athlete's achievement, we (literally) applaud them. But do we want to applaud a sketchy human being? But can't we separate sports' achievement from an athlete's personal life? I don't know the answers.