As I understand it, JWs do not have specific childrens' activities/groups as some other religions do (e.g. 'Sunday schools' 'youth groups' etc.).
It is reasonable to argue, I suggest, that therefore all those in 'a position of authority' in a congregation have responsibility for the children in a congregation.
On that basis I believe that each congregation should have a written (and published) 'Safeguarding Policy' signed up to by all 'persons in authority', that all such persons should be subject to full disclosure CRB checks, and that they should receive documented training in that policy.
If done properly this might help to ensure that cases are dealt with properly - at the least it would bring home to the 'persons in authority' that they have a specific duty and are personally responsible for the way they act. No more 'Nuremberg Defence' of 'I was only obeying orders of WT HQ'.