Some of the people who post about it are fanboys and want to root for their home team like it's a football game. You'll find some of that in every city that has a Mob family.
However, for some reason it's more prevalent in Chicago. Probably because The Outfit had such a huge reputation and is now only a mere shadow of itself. It's difficult for some of the home team fans to accept. That is the best and most logical answer to your sarcastic question.