I've read a lot about this period in history, and although Jews and Catholics have made great progress in their friendship with one another, in my opinion-
the subject of Pius and his role in saving, or not saving Jews is just one of the subject that we will never agree upon.
In fact, I would put it pretty much second to the discussion about whether or not the Messiah is yet to come, or is coming back a second time.
I believe that unfettered access, for a limited number of Holocaust researchers, to the Vatican archives, would be the only way to break the impasse.