To explain from a psychological level, human memory is easily affected by external influences, especially human emotions are inherently fond of preconceived ideas. If you receive false information for a long time, you will believe it as true over time. Even if there is later evidence that what they received before is all fabricated, they will become reluctant to accept it, and they will believe that everything before is the truth, and even more that the evidence of the latter is used to cover up the facts of the former.
By analogy, the "Mandela effect" is also due to the memory errors that people have when reading this conspiracy theory. The situation is a bit like the hallucinatory memory of "Déjà vu".
Once the brain's memory mechanism recognizes that an event exists, it assumes that the memory exists from the beginning.
Maybe it's... the founder of the "Mandela effect" theory "Fiona Broome" who claims to be a "superpower researcher" did not really encounter parallel time and space and caused memory errors. The purpose behind It may be so simple to invent this theory for the sake of reputation, and those who have heard it or are attracted to it continue to ferment events like a snowball effect to form a collective memory error.
Regardless of whether she has become famous for this theory or has a long history...
At least she has a name left in history!
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