he didnt tackle the QB. He launched at a sliding QB and the first contact was his forearm - which happened to have additional bracing.
Confuses everyone? its one specific issue- a player giving himself up.
They are all professionals that have agreed to play within the rules of the game. Dont like the rules, go find another game to play.
Or continue to play in this manner and find yourself ejected, fined and suspended. His choice.