The trick is this. The ridiculous and abusive act that these men asked her to somehow reinact (I'm not even sure how to explain what they did), can be brushed off by JW's as so absurd that it was just these guys doing something wrong. This is EXACTLY the way it plays out.
Rogue elder
isolated incident
nothing in print suggests that so it was wrong
they weren't following the direction of the slave
etc...
So while it is shocking and yet.....not shocking that it occured because of how we perceive the culture and the elders role within that culture....people there will no doubt bristle when they hear it, but they will brush it aside as not representative of the majority of judicial meetings. They are of course technically accurate.