“It’s very sporting. Close to the only home field advantage that’s left in the NFL is the crowd’s ability to make signal calling harder for the visitors. If you’re going to make the crowd be quiet why even have one?”
I see no particular reason for the home field advantage to exist. The crowd can mind its manners if it wants to be there.
Home field advantage is the point of tying a team to a location, of not just cycling all the games around the country at all neutral sites. They ARE minding their manners, the correct thing to do is to yell and scream and support your team.