I respect your opinion, and everyone elses by the way, but here are a few points off the top of my head in response to your points:
Protecting underage minors trumps just about everything, in my opinion.
So, then, why don't the authorities go after every gang, like MS13, Bloods, Crips, etc., that recruit underage minors to do their dirty work?
Young people reared in a cult are hardly able to make rational, individualistic decisions in their best interests even beyond the age of consent!
What are we to do about these people?
What if somebody had spoken out earlier in the case of Jim Jone's Temple? Could hundreds of lives have been saved?
Look at it this way. If any group has God Almighty on their side, they have nothing to fear from any investigation at any time.
Even if it's based on a 'hoax'?
But, if they only have their own depraved agenda masked in a cloak of righteous worship----any manner of predation can occur.
Who is to judge when this might be the case? You? Me? I can mention some behavior that is depraved, in my opinion, which is not masked, as you say, in a cloak of religious worship. Should those people and their children also be subject to this type of treatment?
Privacy is an artificial issue when children are being corrupted.
How far are you willing to take this?