I think one of the bigger flaws in a lot of religious/church groups is the tendency to refer to one another as Brother™ So-and-So or Sister™ Such-and-Such. It blurs the lines (boundaries) of who is actual FAMILY and who is not. People who are wont to prey on children are thus enabled by this blurry language that evokes closeness, even when it isn't warranted. People - children in particular - want to protect "family", and certainly the WTS encourages that in its Insight on the Scriptures entry on lying (ie, Theocratic Warfare™).
While malicious lying is definitely condemned in the Bible, this does not mean that a person is under obligation to divulge truthful information to people who are not entitled to it.
If a child has to choose between going to the "scary" police and denying that anything bad happened to them when they were with Brother™ Handsy or Sister™ Creepy and one choice is going to Make Jehovah Sad™, it's not a far reach as to what that child might do or not do to keep a semblance of normalcy in their lives.