Like others who have responded to the OP, I'm struggling to find the right words in my response.
The CO's response to the sister saying to him she had difficulty believing in God with the paedophile giving talks was indeed chilling, and evidence of cult brain-washing. It is obviously dangerous to blame Satan - an invisible being who likely doesn't exist. We are each responsible for our own actions.
IMO, this case, in a nutshell, represents everything that is wrong with the WTS. They are either unwilling or unable to deal with paedophiles in their midst, due to their desire to be 'better' than other churches.
This sister should go to the police with her concerns - grooming, inappropriate touching is just as much a crime as child rape.