If the accused sexaul abuser doesn't admit to the act, the elders are told to leave the matter in Jehovah's hands.
Gee what could possibly go wrong with that approach ?, as for example the accused might attack again, move to a different location and attack again.
This is how the ancient Hebrews would have handled the situation.
The JWS are technically emulating that ancient civilization.
The ancient Hebrews were not an advanced civilization, so their rules of social standards were not what you would consider by today's standards as being effective or practical.