I'm pretty sure the Zionist leadership was more concerned with opening up Palestine to Jewish immigration than it was with saving European Jewry from the Nazis. Otherwise they would have looked to other places to save Jewish refugees. The United States is the perfect example. The American Jewish community could have lobbied congress for immigration liberalization, but instead it put it's faith and confidence in the judgement of the Zionists.
18 Turkish journalists face prison for 'terror propaganda' (AP)
from the article: The Arab position on the Holocaust