Giving thought to why people find it so difficult to leave a toxic group, I remember about Oxytocin, the 'love/bonding hormone'. OC (oxytocin) is most well known for babies bonding with their mothers, sexual arousal, etc. But it also has a role in group ritual, religious ecstasy, etc. Some people produce more from their hypothalamus than others (devotees, followers, bonders) - other
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"Cults," Sects, and "New Religious Movements"