Pope Pius XII (the fact that you didn't know the exact pope leads me to believe that your understanding of facts on this one is pretty slim) has been credited (by prominent Jews at the time) with saving the lives of something like 850,000 Jews.
How many Jews in Europe have ever been credited with saving the lives of 850,000 Jews in the 1930s and 1940s?
The fact that you thought Horowitz should expand on his comments had me thinking your knowledge of the facts were about nil. I'm not Catholic so I don't give a rats ass which pope Pius it was.