From a psychological point of view the invisible entities---lizard people, body thetans--are the disavowed feelings and emotions, fear, rage, anger, negativity, that are not considered acceptable to display in 'civilised' society.
The chemicals that give rise to the feelings are still produced in the body as a result of stress and fear but, being disavowed, have to be translated into e
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"Cults," Sects, and "New Religious Movements"