The fact that European Zionist Jews made a concerted effort to establish a Jewish homeland in Palestine is sufficient. Of course the Israeli Jews encouraged all Jews to move to Israel, but the right of Zionist Israel to exist in Palestine was established in 1948.The point is if half of the world's Jews do not move to Israel then why do the other half have to live there, they don't, and so they can suggest a compromise where they divide the land with those who were there prior to the UN opening it for the Jews.
"This right was acknowledged by the Balfour Declaration of November 2, 1917, and re-affirmed by the Mandate of the League of Nations, which gave explicit international recognition to the historic connection of the Jewish people with Palestine and their right to reconstitute their National Home."