Question about Knowing (spoilers)

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Why did they not let the parents of the kids go with them? Did they think they were not pure or what? I don't get that as I would want to go with my son to help him.



I assume it's because, to truly start over, they need people younger, yes. Or "that's how it's done," or somesuch. There's not supposed to be a perfectly explained or unassailable answer, though.