These aren't rational people, you can't reason with them and you will never change their minds through debate. They respond to social pressure and emotions. If you can get them in a situation where all their peers believe something, they'll believe it eventually too. You might be able to work through their emotional reasoning and guide their feelings, but the best way to get through to them is to find a way to get two of their feelings about an issue to contradict each other so that it creates severe enough cognitive dissonance which forces them to process the conflict rationally in order to resolve it. Easier said than done, though.
... find a way to get two of their feelings about an issue to contradict each other ...
That's the easy part.
... so that it creates severe enough cognitive dissonance which forces them to process the conflict rationally in order to resolve it.
That doesn't work because they are not only used to live with severe cognitive dissonance (doublethink, as George Orwell called it), but it's part of their training as cult members. They don't feel the need to resolve the conflict because their peers don't do that either.
They are all part of a gigantic Ash experiment and can only change when their peers do it first, or by changing their peer group. Maybe you can change their coworker peer group one by one, but most likely their online peer group is much stronger.
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