Unlike the teams or coaches, WE are expected to NOT make a mistake.
Ask any fan, coaches aren't expected to make any either. And besides, every single one of those fans in the stands knows more about it than the coaches do.
Honestly, my wife has taken to not sitting among our own fans in a game I'm coaching. She tells me it's amazing how stupid we are in the eyes of the fans during the game. And when those fans are parents (and in my case, affluent parents who are used to getting their way), the critcism is magnified. Parents have not only the bias of being a fan, but of it being their child as well. I'm sorry, but no one is unbiased when it come to their own kids.
I was once told that there are three things every man thinks he can do better than every other man: make love, grill steaks and manage a baseball team.
My steaks aren't THAT great.