sd-7 - "One would think that an offense of this sort would warrant public reproof and maybe even a local needs talk about the need to protect your kids, like, right afterwards, so people would put two and two together on their own and keep their kids away from him."
Unless, of course, they end up doing more than just keeping their kids away.
Say this happens with three different guys in one congregation over the course of 3 years (not an improbable scenario, BTW). By the time the third instance has been "dealt with", I guarantee there'd be more and more families who'd find pretexts to move to different congregations, start calling the cops, donate less, even fade with their families, whatever.
Duplicate this in even just a third of the congregations in the US, and you'd start to see some serious cash flow and membership problems.