While the fans certainly had something to do with Golden State beating Dallas, Don Nelson is the primary reason. He is the most innovative coach in the game, and a great mind in general. The Golden State vs. Dallas series was really Nelson vs. Dirk.
Nelson had something to prove to himself, and Dirk is a very modest man who's primary gift in the game of basketball is his mind. While Dirk has physical gifts, such as being a 7 foot shooter, he isn't faster, stronger, more passionate, or more intense than anyone else. He is smarter. He plays in his head, and that is the game Nelson plays best. Nelson got to Dirk, plain and simple. Dirk is a leader by example, and when he crumbled, everyone but Stackhouse did as well.
The fans could have helped Golden State in the next round. However, once the buzz was on, in the wealthy bay area, the true fans that went to the Dallas series couldn't afford to make it to the next, and Golden State, in turn, crumbled.
As far as McGay, he was kinda right. The original post is about as clear as saying,'what are the 5 best foods?'. If anything, he was adding to your thread, so you should probably thank him, instead of telling him off.