“”How does cult psychology work? How is it possible to persuade human adults to enter a weird cognitive landscapewith no basis in reality? To enter a fantasy realm so profound that they’ll willingly die for whomever has been selected as the local Messiah?”–Matthew J Sharps Ph.D, “Cults and Cognition: Programming the True Believer.” Psychology Today. October 2, 2020.
Partial answer: Through dissociation group psychology, and cognitive dissonance.
“…cognitive dissonance (e.g ., Festinger et al. 1956), which manifests itself in the tendency to overvalue anything in which we’ve invested too much—money, time, emotional energy, whatever. Cognitive dissonance essentially means that the more you’ve paid, the better you like. Whether it makes any sense or not.-ibid.