Sure but if a player IS falling at a rate of knots and if he hadn't, he would have been hit in the chest / stomach, a defending player cannot break the laws of physics. I have been saying this for a while now, the NRL is penalising / sinbinning / suspending players who literally could not have done anything different because physically, they cannot react quick enough to change. There has to be an understanding of reality with these decisions. It is a contact sport, players will get hit in the head from time to time. If you want to disobey the laws of physics, then league cannot be played. There has to be some common sense.
Forceful hits to the head that can be avoided should absolutely be banned and cracked down on. Incidental ones that are totally unintentional need to be adjudicated on their merits.