Right now, I'm low on time, but I will go for a quick and dirty explanation. Keep in mind, indoctrination was easier simply because we were isolated from not only them, but ALL of our family and friends, with restricted visits and monitored phone calls twice a month. Thus, CEDU heavily controlled influence. Second, if a student ever complained about CEDU, the staff would then totally undermine and discredit the student to the parent going as far as to either exaggerate or lie about the student's disclosures or activities. Then, they pull the whole "deadinsaneorinjail" fear tactic so parents would be too afraid of the consequences of leaving CEDU. Parents were afraid their kids would wind up "deadinsaneorinjail" if they withdrew them. That is what CEDU stressed to them time and time again. It was their Ace in the Hole.
CEDU also looked pretty harmless - Camp CEDU up in the mountains. The brochures were nice. People BELIEVE advertising folks. No one could imagine the accreditation would be bogus. Staff seemed like they really cared.
Also, the staff did not present the reality of of the brain bending, psyche twisting, NON-therapeutic mindfuck of an immersion into raps/propheets.
So - fear, ignorance, and in some cases, apathy. They just wanted you gone. They didn't really care when, where, or how.