I just skimmed the police report on that Minnesota football team thing and im not exactly sure if everything was kosher. What ended up happening was that the girl got drunk after the game, partied for a while, got hit on by 2 guys (which I presume to be on the football team), and went back to their room to have sex. More guys started coming into the room after a little while and she even has recollection of one of the dudes forcing himself on her in an abusive manner. At one point she supposedly wrapped a blanket around herself and told the guys to stop, but was not successful in her plea. If I am to at all believe in the girl's testimony, id say that sexual assault was involved here. The only complicated thing about the situation is which guys were justified in banging her and which ones werent. The problem with the case is that consensual sex was involved, there is video evidence (of what I presume to be more towards the beginning of the gangbang) of her enjoying herself, and there is no evidence other than the girl's testimony of any unwanted actions.
It looks like some of the players suspended werent directly involved in the sexual activities, which is the only valid point of contention that I see. Otherwise a rather shameful boycott.