It's one if not their biggest cult move.
and it's ironic. In my case it went this way "you are acting like a cult..."
"Whhhhhhaaatt!!!! How dare you insult my god and leader (gb) I will now mistreat and shun you!!" F $&%ing twisted.
Even in the convention interview where the parents are depressingly gloating over their shunning. (Again twisted on all levels) they out right say what brought the person back was missing their family. Not that they realized it was the truth. Etc
I often relate this to the inquisition. And torturing someone until they profess whatever the church leaders wanted to hear. How does that make them a true convert?
Stupid cult.