At the risk of being flamed to death, the two witnesses rule is not, in itself, some method for deliberately hiding the existence of paedophiles.
It's a rule based on the a principle of justice that means an accusation from one person is not sufficient to prove guilt in itself. Even secular authorities end up in one person's word against another in criminal and civil cases. Even in the case of child abuse, the accusation of a child is not usually sufficient to secure a conviction without some kind of "second witness", be that forensic evidence, other witnesses/victims, a confession etc.
As far as the elders are concerned they are only responsible for whatever spiritual reproof may be needed and for ensuring congregation members are not placed at unnecessary risk.
So what does the two witness rule really mean?
The two witness rule does not prevent the reporting of a alleged crime to the police. The WTS claim no one is prevented from doing so. The reality is that the implementation of this is down to the individual case and no one can guarantee that a victim or their family may not know they can do this, get any encouragement to do so, be supporting in the process or feel some social pressure to keep the congregation out of it.
Mandatory reporting of any accusation would stop this.
The two witness rule does allow for a clever paedophile to play the system assuming no report to the secular authorities is made.
Mandatory reporting of any accusation would stop this.
The two witnesses rule does little to encourage the elders to take proactive action to protect the congregation.Mandatory reporting would (a) allow the authorities to investigate, potentially forming a second witness through forensic evidence and (b) send a clear message to the congregation that caution is required.
The two witnesses rule does still prevent an individual from being judged by the congregation without sufficient evidence.Mandatory reporting does nothing but reduce the risk for the elders and the WTS. It opens up the opportunity to obtain evidence that forms that all important second witness. It can serve to help protect the congregation without elders having to drop hints to people.
The issue here is not really the two witness rule. It's the reluctance of the WTS to implement a clear policy of reporting all accusations of abuse to the police that allows some potential for a playing of the internal justice system of the congregation by a smart abuser. It allows elders to be placed at risk of making a mistake that could cost one or more victims their childhood.
Just implement mandatory reporting and much of this risk goes away.