Before denigrating one approach over another, I think one has to recognize that they all act in concert. Teaching children about good vs. bad touch, informing parents about appropriate and inappropriate interactions with people they entrust their children with, and placing clear boundaries around those caregivers all play a role in prevention and detection and, who knows, maybe just that worked here and brought this case to light:
Great show on WAMU last night on just that:
http://onpoint.wbur.org/2015/06/03/child-sex-abuse-duggar-hastert-biden
What I'm not sure works are the rules about boundaries. (Following years of scandals and abuse) the BSA today has among the most elaborate program I've ever seen, including all three of these components. I'm not seeing any other clubs nor schools anywhere close to having implemented such a comprehensive method.
And to the person writing something about the "well off", let me tell you how unbelievably resistant to all this education and information the best heeled parents can be, refusing to utter the words printed in their scouts handbooks, refusing to let their scouts be informed, refusing to complete child safety training and sneering at silly "two-deep leadership" requirements. So, no, money has nothing to do with it. What has to do with it is taking all of the pieces seriously, continuously. Money and standing can actually be in the way of this ("don't tell me what to do", "no one can teach ME something, I've got my Ph.D.").