If you look at any successful movement, they purge internally till they get to a percentage that is on code that makes the sell outs isolated and socially ostracized.
Our own history is an example. Only a small percentage of Montgomery blacks supported the boycott initially. MLK Jr was told by many in Montgomery to go back to Atlanta. Their reason? They told him if this doesn't work, we will have to deal with the blowback. The police, the Klan, lynchings, etc. Understandable to some extent. What made the bus boycott work is that anyone black who was riding the bus was socially ostracized. His kids went to the same school as the black boycotters, he lived in the same neighborhood, same church, shopped at the same stors his neighbors, many went along not because they believed in it, they went along because they didn't want to be excluded from black society.
Today, more and more traitors and sell outs are being isolated. Case in point, Omarosa. She still can't show herself to the black community. The only one who did the same or similar was Kanye and the only reason I can think of he got a pass was because 1. people believe he's cray AF and 2. unfortunately black people will excuse off code behavior if your music is good.
But we are seeing things changed. I never would have thought Barack Obama would lose his rep among blacks. Look at the blowback at Oprah and Gayle over Michael Jackson? It's happening. Not as widely as we would like but don't be fooled, people are very, very worried about the grass roots.