I think you are bringing up a social issue rather than a religious one. Many pedophiles walk free in the legal system and rape more than one kid before they actually get caught and sent to prison.
Unfortunately, religious freedom involves a degree of impunity for certain actions within the religious realm. In this group, we discuss the latter. Because the WT insists that they do not shield pedophiles and in their minds they are absolutely correct because a pedophile is not a pedophile unless there is a second witness. If they were to get rid of that rule, then the authorities are likely to be involved more often. Provided that this is also not perfect, the moment a victim is able to report their abuser without fear of retaliation from the elders, then it is much more likely that they will come forward.
Expecting the congregation to publicly announce pedophiles is far too unrealistic at this point. Both from the JW culture perspective as well as from a legal perspective.
Much more damage is being done by holding back the victims and pressuring them into silence. This entire silencing process depends strictly in the two witness rule, simply because the two witness rule is the only way they can silence the victims using the bible. If the bible wasn't involved, they would hardly have any tools to control them.