They need to stop penalizing these bang bang plays. There is absolutely nothing a defender can do int hat situation where both players are moving towards the ball and collide.
Penalizing it won't take it out of the game because, as Scotty once said, "Ye kinna change the laws of physics."
If the defender drops his head into the receiver or leaves his feet, then fine, "Book him Dano". But mere collisions like this can't be penalties. I mean really, if you are concerned about head injuries, then move to 2 hand touch already.