I must agree that the people around him either knew something was going on, or at least should have known something was not right. After all, wasn't he kept around for years? And, made an elder?
Notice that it was the cops that caught him, not the JWs. I really don't think that someone suddenly develops this behavior all of a sudden in mid-life, as if this was the first and only time he attempted it.
Wonder how long it would have gone on if the police had not been monitoring such activity on the web? Or perhaps, he would have been one of the bethel lay-offs and sent to some unsuspecting congregation?