Quite easily actually.
Telling the truth, out loud, in spite of the opposition a person faces from the cult members usually does the job.
It isn't fun, and it is costly, but if the cognitive dissonance gets loud enough, the cult will make a concession or two. Once they do, it's all over. Most people don't want to do this however, they would rather walk away and "heal.&
Forum:
Destructive Churches