I caught the episode last night, also.
I think what made me relate the episode to the JWs was that it was a very small religious group. Also, the older man who was 'hiding' the mother was JUST LIKE a JW mouthpiece (ala J.R. Brown).
And, the victims kept referring to the church as a 'cult'.
ALSO, I called my friend (badwillie on this Forum) to tell him how much the mother reminded me of his mother (not the actions of the mother, but, the personality, and the smug facial expressions).
Oh, and how the mother blamed the victims instead of those who were responsible for the horrible acts.