Maybe the refs don't ping them because they are not really doing anything different than every other rugby team, no matter where they are from. Perhaps, you could take off the blinkers when you watch, that way you might have a more objective view of what it is you are actually watching.
Then why is everyone trying to knee a Kiwi flanker in the face or smash his face in? Let me put it like this.
This was the great Michael Jones's era.
When tackled the tacklee wouldif he valued his hands, release the ball pretty much immediately. Forwards would link up (backs would not dare to be involved) to drive over the tackler and tacklee, both of whom would either try to roll away or cover head, face and other parts sensitive areas to avoid being trampled into the ground. Bruises and scrapes now and then received would ensure if you were foolish enough to slow the ball down or if you fell on the wrong side and purposefully sealed the ball off you know what was coming next TIGER STRIPES courtesy of a size 11 boot!
This is Richie McCaw's era
A player is tackled then rolls around for a bit adjusting his body position in an attempt to place the ball back advantageously for his teammates. Meanwhile the tackler pops back up to his feet and squats over the tacklee trying to rip the ball from the tacklee's grasp or, at the very least, to stop its release. Meanwhile everyone else in the vicinity launch themselves into it or drives to ground piling up over the ball because more bodies means more space the ball must cross which means it will be slower. Meanwhile some will stand at the side with their hands raised pretending they know exactly what they are doing when no else does.
While this is all happening everyone fans lazily out across the field with the knowledge the ball will not be coming out anytime soon. The scrum half could put on the kettle phone his mum and have a chat to his sister while who is visiting his mum.
That is todays rugby and he who cheats the best will win the game. And they ask if McCaw is the best ever in his position.
Well I think I just explained why he seems so good. Back inn Jones era he would not get punched in the face or kneed. He would not dare to slow a ball up. In fact none of these fetchers would try and cheat.
Traditional rucking produced quick bal and also occupied forwards who might otherwise loiter in midfield clogging up the pitch.