Embed from Getty Images Fanbases of struggling teams have a common war cry: “Fire the head coach!”Whenever I hear this, I think of 1995 Bill Belichick, 1994 Pete Carroll, 2001 Tony Dungy, 2002 Jon Gruden, 2012 Andy Reid, and 2002 Tom Coughlin. You know why? Every one of those guys won a Super Bowl at…