It's called indoctrination and undue influence/thought reform/mind control.
I well remember the fear of the apostate boogeyman with somewhat mystical powers to cause people to leave "the truth" with just a few magic sentences. They were predators who craftily lured people "lies, half-truths, and misrepresentations". They were "angry and bitter".
And whenever there was a red flag, there were the thought-terminating cliches. "Wait on Jehovah. Where else will we go? The light gets brighter..."
Hindsight is 20/20.