The very first Rashi in Bereshit asks an important question:
"Rabbi Yitzchak said, There was no reason to begin the Torah [before the section of] 'This month will be for you...', which is the first commandment which Israel was commanded. What is the reason it begins with Creation? Because of the verse, 'The power of His actions He told His people, to give them the inheritance of nations.' (Tehillm 111, 6) For should the nations of the world say to Israel, 'You are thieves! For you conquered the land of the seven [Canaanite] nations,' Israel can say to them, 'The entire world belongs to the Holy One, Blessed is He; He created it, and gave it to the one for whom it was appropriate in His eyes. He gave it to them willingly, and He willingly took it from them and gave it to us.'"
Does Rashi really believe that this answer will satisfy the nations of the world? Does he actually advocate quoting Scripture at the United Nations, as if this will convince our enemies that our claim to the Land of Israel is legitimate?
Rashi believes no such thing, as is implied in his quoting the verse, "The power of His actions He told His people." The nations will never accept such an argument, and the Torah does not begin with Creation in order to convince them otherwise. Rather, it begins with Creation in order to "tell His people" - that is, so that we, His chosen nation, recognize the justice of our cause. Before we can ever argue on our own behalf, we must be convinced that right, morality, ethics, and justice are on our side. We may repeat this claim to the nations, and it will likely have little effect. Yet we must repeat this claim to ourselves, so that we never lose sight of the righteousness of our cause.
As Israel embarks on a ground incursion into Gaza, our job is to support the State of Israel in any way that we can. We must remember, despite the claims of so many, that our cause is just, moral, and right. We are in the right religiously, politically, and ethically. Once we internalize this, in the face of overt and covert anti-Semitism, we will be equipped to join together as brothers, as one nation representing the One G-d, prepared to defend our eternal right to the Land of Israel in any way that we can.