Pius XII did speak out. Even the NYTimes said so! And he learned how that failed in Holland. His quieter complaints were not "limited" but were aggressive enough that Hitler decided to have him assassinated. He didn't save some lives - he saved over 800,000. That's according to the Jewish Israeli historian Pinchas Lapide who fought with the UK army in WWII. It never ceases to amaze me how little people know about this subject, but how even less that stops them from running at the mouth about it.
U.S., allies conduct 31 air strikes in Syria and Iraq against ISIS militants (Reuters)
from the article: ADL urges Pope to suspend Pius sainthood over Holocaust inaction