Generally you can disable a meme's infliction upon behaviour by analyzing it. That's a proven solution for the effect of stereotypes, and similar memes of prejudice. As for racism etc., you can eradicate it by posing a clear inquestionable boundary between those who are the members of your society and those who aren't. As long as there's a full concensus on this boundary, each eruption of internal racism would quickly vanish. Again, 'dangerous meme' is quite NewSpeaky.
Groups fighting for people's social position to be changed' is part of that natural evolution.
Examining such natural evolution when separated from this kind of cultural struggle is like seperating oxygen from air in order to examine the air 'without external additives'. Great questions Drakir, good to have you back.