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Something called the illusion truth effect and the more you hear something the more likely you have to believe it when there's no trouble behind it.
Now think about how rumors spread how propaganda works or how someone can repeat a lie so many times that people eventually accept it as fact.
Describing unsettling parties you don't have to be stupid to call it before this to happen to you you're being completely mistaken something being familiar for it being true.
Just because you have heard something a thousand times doesn't mean it's true you might just be used to hearing it but i don't know how to undo it when the time is right.