Is the two-witness rule really unreasonable?
The "two-witness" policy is one we find mimicked in one way or another in judicial systems of every developed society on planet earth. Essentially it means one thing: corroboration. That is to say, if an allegation is made it cannot be acted on punitively unless there is corroboration. So insofar as this single issue is concerned, I think it reasonable.
Yet corroboration is only one of many facets of a robust and fair judiciary, and in relation to children in particular. As pointed out by previous posters, it takes specialized training to investigate allegations of child abuse. This training is not a prerequisite for Watchtower appointed elders. Yet proper training in this field is not only essential to sorting out any fact or fiction of the initial allegation, it is secondarily essential for protection other children who have exposure, ,like the kids next door or down the street.
Watchtower goes on and on about following Jesus, yet the biblical Jesus would have folks love their neighbors as they love their own self. Yet when it comes to allegation of child abuse Watchtower fails to take the simple step of encouraging victims (or their guardians) to report to secular authorities trained to investigate, that is if local law does not require Watchtower appointees to make the report. This gap in Watchtower policy turns advice from the biblical Jesus on its head.