This, I think, summarizes the whole crux of the matter. Pius XII worked behind the scenes to help as many Jews as possible escape persecution. If had spoken out publicly, he would have undermined these efforts and would have invited even more Nazi reprisals upon the Jews.
Those who criticize Pius XII for supposedly remaining silent or doing "nothing" are ignorant of history and they lack any real perspective on what the circumstances of those times were like. They think that words would have ended the Holocaust but, in reality, it was the Allies' defeat of the Nazis that ended the Holocaust. Unfortunately, the Pope didn't have an army at his disposal but he did what he could do in a very real and practical way to aid the victims of the war, including the Jews.
This is correct.-—I know from ones who lived that time in history. I happened to be a “gentile” in a large city high school that was comprised of about 95% Jewish kids, whose parents had been fortunate enough to escape the horrors of the Third Reich, but had been forced to leave relatives behind. Mingling with them and their parents, I learned of many things first-hand. My experience of sharing in their stories has been a great benefit for me. I also know personally of a number of them who converted to the Catholic Church in light of what they endured.
Of course I have given away my age saying that I was in high school at that time!