I think this all turns on terms of the settlement. If the plaintiff gets their money, no strings attached, just so the WT can avoid a lengthy and expensive trial, then I agree that they are destroying themselves in the long run as now any former JW could just say they were abused (even if they weren't) and win a jackpot. But if the WT is exchanging money in return for silence, then they are definitely getting the better end of the deal.
Though I find it hard to believe that any victim would settle for money. If it were me I would want to do the maximum amount of damage to the organization. Money comes and goes, but revenge leaves a sweet taste on the tongue long after it's over.