Because you as things stand there is no clarity on the matter.
Everyone with 10/20 vision, two functioning brain cells and access to the play in question knows that was a penalty.
Yet, the referee, the TMO and the CC have all say, either by action or omission, that it was a fair tackle.
Not only coaches and players but more importantly, fans, like to know the rules of the game and as things stand down, we clearly do not.
If you ask any tier 1/2 coach/player if next game that same play happens again, what will the ref call? They can probably make an educated guess. Samoans probably with more accuracy than the rest, but if they are honest, they will you "i am not sure, i dont know".
It is simply unacceptable that the players, coaches, pundits and fans understand the rules to be about one thing while the refs do not apply that understanding in terms of calls. That is not good enough.
That is why WR needs to make a statement.
As far as anecdotal evidence goes, i know a considerable amount of people, disproportionately Australians, that are done with this **** and stopped watching the sport (not just because of this incident, but with inconsistencies in general). And another not so minor amount who watches less (still follow their club but stopped watching other competitions/teams). They find the game less attractive, and understandably so.
And to be crystal clear. The problem is not two refs calling two almost identical plays differently. You can miss things, mistakes happen. Fans will understand that, eventually. The problem is when you add TMO and CC. When two groups of people who are experts on the rules have 10 camera angles, slow-motion review, and watch identical plays with time to review them and come with not only different but almost opposite calls, well, you have a problem. Congruence is an essential element of fairness and people do not like unfairness when it comes to the sports they follow. At least not this much.
Last, considering what's being asked from the players on a regular basis, i dont think what people are asking from TMO's CC and WR is too much. Just do your bloody job.