The purpose of all this is to get other moral cowards who may nominally be part of the group to "out" themselves, thus amplifying the effect. If that doesn't happen, media and other tools of deception can be used to appear to make the 'rebel' more important than he/she really is.
Classic Marxism. A tactic straight from Hell. And that's where it belongs.
Thank you for articulating this tactic so clearly. I’m sure we have seen this tactic used a million times before, and it’s nice to have it so clearly identified now.