“Without the yishuv, Hitler would have killed Judaism.”
Actually, it should say “without the Americans”, Hitler would have killed Judaism (okay, the Brits and the Russians deserve some credit to). While one can (and should) perceive the Allied efforts to defeat Hitler as an example of Hashgacha Pratis, the yishuv did not play a significant role. Indeed, the efforts of the zionists were a major factor, and perhaps the only factor, explaining why the British were anxious to keep Jewish refugees out of Palestine, and in fact, out of any other other place, and one can argue that it was due to the zionists that the expulsion of European Jews (which was Germany’s original plan) became the genocide of European Jews.