The problem with Watchtower is vastly different from a typical church. Attendees to a church don't usually "work with children." They sit there and listen then leave. There are volunteers at various levels and parents should be aware of the dangers of sending their kids to unknown volunteers to put up Valentine decorations or whatever. They can be forewarned in general announcements concerning such matters and of course, the church should weed out any known predators from volunteering.
Watchtower attendees are asked to do more. Skipping all the volunteering at assemblies and whatnot stuff that is essentially the same as I mentioned above, there is still the organized recruiting work. There is still the exclusionary lifestyle that tells them to trust the insiders and distrust the outsiders.
On that second note, Watchtower will not warn parents in any way when a known predator is an insider. They might tell the predator not to work with kids, but nobody is told that the kids should not work with him. If their hands are tied in that they cannot make specific announcements, then yearly (or perhaps quarterly) announcements to check specific pedophile websites that will name specific predators in the area will eliminate the problem. Once a few parents find Brother Chester on the list, they will spread the word.
On the first note, I would love to say that minors should not be part of the recruiting work, but I do recognize the cult and how it would never bend that far. But they could easily bend far enough to say that parents are the only ones who should work with their children in recruiting and if they don't stay with that, the parents should fully investigate such people that work with their kids, before and after the encounters to make sure it is/was safe. They should actually suggest that your kids don't work with elders, MS's, the C.O., old pioneers, ANYONE at all other than their parents or grandparents or guardians. If they do let it happen, they are going on their own without congregational approval of such people.
And as far as cases coming to their knowledge of problems, I know they are going to call HQ with every last problem, but they should halt proceedings once they are aware of charges and go to the police WITH the accuser. They are not determining guilt or repentance, they are accompanying a minor who is reporting a crime. Even if the accuser is lying, the accusation is of a crime. Treat it like an accusation of murder. Let the experts investigate. But stand by the accuser because they are either a victim or a troubled lying youth that needs someone to help them. Never do that thing where they make the child repeat the charges IN FRONT OF THE PREDATOR (which is their policy if they don't have two witnesses or a confession). That can be so damaging.
After the child went to the police and things got sorted a bit, after the police talk to the alleged predator, then maybe the elders can look into whether a judicial matter has to be had. And never tell Little Johnny or Suzy to keep their mouths shut. Let the authorities talk to them and their parents about what they should or should not say to the accused or to others that ask what's wrong.