There was no "silence". The Nazis were crystal clear on the Pope's position. Even the New York Times was clear, in 1942, on the Pope's position. (Later on, the fog set in.)
The difficulty was that the Pope was Vatican counsel in Berlin while Adolf was rising to power.
What is your point? Why was that a "difficulty"? In fact, Pacelli became Vatican Secretary of State in 1930, when Hitler was still just the leader of a fringe political party with 12 seats in the Reichstag. It was in the elections of September, 1930 -- after the Depression began to be felt -- that the Nazis became a major player.
"When fearful martyrdom came to our people, the voice of the pope was raised for its victims."--Golda Meir