Difficulty fading out
While I agree with your line of reasoning generally, you forgot the most important aspects of this "voluntary" agreement: It was made fraudulently and under duress.
Fraudulently because we were manipulated into believing that this was big J's organization, that "He" was leading these people, holidays are evil etc etc when the reality is that we were simply misled.
Duress because we were convinced (by them) that we would die in the big A if we didn't do it, much like holding a gun to someone's head.
Both of these factors make the agreement unenforceable, null and void.