I don't think it's an unpopular opinion, I think most agree with you.
It's just certain group of fans, fall in love with a player and that player can do no wrong. If that player doesn't succeed, its not his fault so coaching becomes the scapegoat....you always need a scapegoat.
It's masculine pride. It's "I know what I'm looking at better than you know what you're looking at."
It's the reason regular Joes think they can beat up a professional fighter. It's ego.