It is a chance to do some trickery I say. Of course it is up to you if you want to do this. But I would make some comments after they bashed the Catholics and their faith.
Any religion that hides such terrible crimes, can't be the true religion right?
I wonder how many Catholics are saying "Well the pope -archbishop etc are just men and they make mistakes! Aren't children's well being, physical and mental, worth protecting? Why didn't they go to the police? Only a religion that is more interested in saving face and money, tells their followers not to take it to the authorities.
It would be great if they agreed or added something similar. Then hopefully soon, when the WT is taking to task in a public way, you can remind them they thought those things were terrible about another religion, why aren't they taking the same stance for the WT?
Might give it a try. I do stuff like that at work. Never know when the last straw will happen for a JW.