Hell, it's the only reason Israel even exists.

This is an understandably common view, but it's not true. The only fundamental change WWII brought to Palestine was weakening the British Empire; Zionists, partially due to British support, were by far the ascendant group in Palestine as early as 1939, so Israel was going to appear as soon as the British left Palestine. Zionist wealth and diplomacy, Arab weakness and division, Western colonial ambitions and British colonial policy made something resembling the current situation inevitable with or without WWII.