That might be the reality on the ground in ZA, but I think expecting ethnic self-policing like that in the rest of the West is admitting defeat and contributing to the problem.
It may come to that, regardless of our wishes, but man is that a terrible end. The end-state of multiculturalism is the Balkans, and all it will take is serious economic trouble. Better to stop it in the first place than play the game.
Well, its basically expected of every other ethnic group: white people denouncing white nationalists is basically a formulaic thing expected to be done if asked. If someone is claiming to speak for you, no one but you is in a real position to counteract that claim.
And some jews are doing a reasonably good job of it: for example, if there was a Jewish Conspiracy, it would probably be the ADL.
Thankfully, supporting the ADL is becoming less, expected of a Jew in Good standing with the community. Just as in (probably still the fringes) of the black community people like Al Sharpton are being given less weight in the community as good pillars and representatives of the black community.
Democracy though is inherently interest group focused. No one can do what "black people" want. All the people in government can do is listen to, for example, a Martin Luther King or Malcolm X and make a decision on how well they're a representation of the "black" community. Just as a congressmen can only really listen to a Wayne La Pierre of the NRA as an approximation of what all gun owners as an interest group want.
People and governments can only really listen to representatives of interest groups. If that interest group lets some self appointed people put themselves forward as the voice of that interest group with no real push back, then well, the powers that be and the people at large have to assume that those people really do represent what that interest group wants, or at least is a representative their comfortable with.