head to head hits occur on almost every play in the NFL
you hear that click of helmets almost every play in the NFL involving the takedown of a player, there's helmet collision on plays going out of bounds
it's inherent in the game
a fan getting super-sensitive about his team sees all kinds of things that the NFL takes for granted, the same as an NBA fan is convinced EVERY shot his players should be and-one or EVERY drive by an opponent is traveling
there is a clear problem in the game, for which Burfict provided a textbook example. that must be removed