Coaches try to shut the noise out. Fans are just that - fans. They have no idea about the inner workings of the team itself. The health issues, personal issues, and team chemistry. Then there's issues of what combinations of players complement each other's talents on the field under various circumstances that matter. The list is endless.
For arm chair QBs, all they really see is what plays out on the field, and what they see/hear about in the public. It's difficult making astute assumptions about the team with just that narrow a view.
Yet, the court of public opinion does carry weight when it comes to the direction teams go at times. The last thing a franchise, and coaches, want to do, is alienate the fan base.
Yesterday's loss to the Chiefs is a prime example. The traffic on the internet hashing this game out among the talking heads has even gone to absurd. Listening to them is like listening to a bunch of chatty old women on an old party line telephone system talking about that woman down the road who "may" have loose morals.