What is this "right to sovereignty" based on? DNA? How many generations matter? Would a bunch of white guys have the right take over a country in Africa because Europeans are descended from Africans?

Palestine was never an empty country. Today's Palestinians are descended from people who never left.

Jews bought something like 6% of the country. They're certainly entitled to all they bought.

Do you think Native Americans should have been dispossessed because they never had a formal nation?