I think people are reading too far into it. It's just a joke... The point is that they're telling the subject of the story (in second person so it's addressed

I think people are reading too far into it. It's just a joke... The point is that they're telling the subject of the story (in second person so it's addressed to "you") that you're in a cult and they're going to rehabilitate you - but as you read on, you might notice that the rehabilitation is describing, you guessed it, a cult! It's not actually making a comment that everybody is actually in institutions that are like cults or anything, that's just part of the (satirical) brainwashing that the cult is using to bring people in.