It’s not easy being a fan. Namely, being a fan is a very emotional attachment to a team and/or player(s). And while it is absolutely, 110% acceptable to be emotional about your team and have your emotions dictate your feelings, thoughts, and everything else about being a fan, the problem is that emotions cause one to become irrational about their fandom. And this irrational attachment creates some strong biases that really cloud our judgment.
The lasting result of this is that the overall fan perception of a player (aka the “narrative”) doesn’t necessarily match up with the player’s actual performance or value.