Finkelstein - "...There were a lot of adultery, fornication stuff happening but pedophilia not really."
Ten bucks says a significant number of those cases of "adultery/fornication" actually were instances of child abuse, but were deliberately classified as the former, in part, as a form of denial on the part of local elder bodies.
After all, everybody is supposedly subject to temptation towards adultery/fornication (), but pedophilia? Those offenders are a far, far worse class of deviant, by any reasonable modern standard... and on a gut level, elders had to have known that (not to mention that - considering the Org's track record - some were likely guilty of it themselves at some point ).
Re-labeling an offense as "adultery", "fornication", or "loose conduct" would have enabled more conscience-driven elders to view said offense as a little less offensive*, and therefore an anomaly (as opposed to a repeating pattern of egregious criminal behavior)...
...therefore easing any potential conscience issues about avoiding the involvement of secular authorities (not to mention also conveniently enabling them to more easily continue believing that the WTS was still "God's Earthly Organization").
* Why else do you think they seem to try so hard to determine if the event was "consensual" on the part of the underage victim (female or male)?