If you already know you have the correct worldview, then just present the data to him that would lead someone to believe in your worldview. You can't be immune to ideology without having one of your own. Someone who drifts through life believing nothing will believe anything.
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Teaching children about online manipulation without creating a paranoid world view subject to manipulation?
Ok, this is not going to be a well formulated question, because the concerns behind it are nebulous in my own head....