The ancestors of the Jewish diaspora are too, just like the ancestors of Palestinians, but the Jewish diaspora been out of the state for at least over a 1000 years if not close to 2000, and that's why Palestinians would experience their return and the creation of modern Israel as maybe what a Native American might have experience European colonization and the creation of the US and other modern North and South American countries.

As I stated elsewhere, I don't think Israel-Palestine should have been divided into two states, and that I think that since Israel is the home of Judaism, Jewish immigration should have been allowed, but the focus should have been as much on co-existing and equality as protecting the rights and lives of Jewish folk and making sure sure the constitution of this new one state never allowed anti-semitism. The division of the area into two states with an arbitrary border led to ethnic cleansing just like the creation of India and Pakistan led ethnic cleansing and the mess we have today. The creation of one non-colonial state with equal rights might not have.

P.S. If Jewish people have the right of return to Israel today after Rome performed an ethnic cleansing of Jewish folk in Israel in the first century CE, then Palestinians refugees and their descendants have the right of return to Israel-Palestine after the ethnic cleansings that have happened since the 20th century.