It says that the Pope urges against the establishment of the Israeli State - a question which was hotly debated among Jews themselves at that time, I might add - but there is no "urging" in the letter. He is expressing an opinion. No course of action is recommended, let alone "urged".
And I ask again: the Pope said that he feared it would cause political instability in the Middle East? Was he incorrect?
Who was Israele Zolli?
Your assertion is patently ridiculous. It's akin to saying that General Zinni is "just over in Israel, hanging out, giving his personal opinions, not urging anybody to do anything, and not representing the Bush Administrations Official Policy".
This was Pius XIIth's Official Representative to the US Government. He was representing Pius XII's position -- namely: that Israel should not be given their Homeland back which God promised to Israel forever. Whether it made trouble for the world or not is irrelevant. It is God's promise to Israel that it would be their land forever.
It's interesting to note that the Vatican suggested Israel be given a DIFFERENT piece of ground to settle on, NOT the one God promised to Abraham and his seed forever. Fascinating!!