Learn the game? It is not alright to go helmet to head on a receiver after he catches the ball and takes two steps. He can run twenty yards and it IS STILL illegal to ram your helmet into his jaw.
It is legal for helmet to helmet contact to occur between a player engaged in running the ball forward and a defensive player. How may times have you seen a running back lower his head and deliver a blow to a tackler, resulting in helmet to helmet contact? If you watch the replay, the defensive player’s helmet is at chest level, UNTIL the offensive player lowers his head slightly. He ceased being a receiver after he took two steps; you can’t have it both ways.
“It is not alright to go helmet to head on a receiver after he catches the ball and takes two steps.”
Burfict is probably auditioning to replace Lewis as the dirtiest player in the NFL, cut him some slack.