Israel wasn't created from nothing post-WW2. It was already 50 years into building a jewish state in first the Ottoman Empire and then British Palestine. Holocaust refugees, although symbolically important, were never a large portion of Israel's immigrant population.
The UN declaration was recognition of reality on the ground. And was, btw, rejected by the Arab parties and doesn't carry the force of international law. Israel declared its independence irregardless of the resolution the following year.
And Arabs owned about 8% of the land. Still more than the Jews, but nowhere near the 94% implied by omission.
In any case, go look at the malaria maps and desert areas. Notice how they match up with the areas allocated to Jews. The Jews may have gotten allocated slightly more land, but it was not fertile or desirable land.
The UN declaration was recognition of reality on the ground. And was, btw, rejected by the Arab parties and doesn't carry the force of international law. Israel declared its independence irregardless of the resolution the following year.