According to the psychological profile, he became obsessed with his past life, romanticizing it because he felt like he didn't belong. This then led to him wanting to travel to a world that would give him the sense of belonging he craved.
Others he recruited to his cause had similar feelings, as near as I can tell. Or they were compassionate for their fellows. Either way....
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Others he recruited to his cause had similar feelings, as near as I can tell. Or they were compassionate for their fellows. Either way....