More than 750,000 Palestinians fled or were expelled during the 1948 war surrounding Israel's creation.
They and all their descendants are deemed by the UN agency to be refugees ....
And as with any other war refugees, they are entitled to return to their land whether or not any Jews want a Jewish ethnocracy on that same land. The law was in place before the Jews there declared an independent, ethnocratic (racist) state. The rest of the world had no business or legal right to aid or abet those Jews in stripping the Palestinians of their land.