I agree with you 100%, my issue I guess is how they would follow through with it. As much as I don't want to say it, it is a part of the game.
Should you remove all first time offenders, no questions asked? Should you remove a player that gives someone a concussion but within the rules? Should you remove anyone who hits with the helmet, offensive, defensive, in a pile, open field, etc.? It's just too grey to make it a black and white rule.