I used to agree with the 2-witness rule, until I dealt with a clever pedophile who only got caught due to a random pediatric visit he was unaware of that was scheduled.
Then I started to see that being able to out-maneuver authorities changed the rile from black and white to shades of gray.
JWs want to avoid the authorities altogether - so they view the rule as black and white.
Those of us who want to protect children view the rule as cautionary restraint. We still want the authorities called immediately. The accused can make their defense to them. As for a JC - see what the police do. Maybe more evidence, even forensic evidence might clear the fog.
As for the clever pedo I dealt with... he had other victims unknown to us. Because I got the police involved, it all came out and he was put behind bars. I wonder what might have happened if I had just said we had no second witness and the pediatrician might be wrong?