There doesn't have to be a modern state called "Palestine" in history to legitimize the fact that the Palestinian Arabs, both Muslims and Christians, are natives of that land. They are the people of the Levant (Holy Land, Lebanon, Syria and Jordan). They all share the same genetic makeup, which is actually unique in the Middle East and different than the true (i.e. pure) Arabs from the Arabian peninsula.
The so-called Arabs of the Holy Land are "Arab" mostly in language and culture, not genetically. Most of their genetics is Levantine-Middle Eastern. A mix of ancient Canaanite, Israelite, Assyrian, Anatolian, Greek, Roman, and yes Arab as well. It's a mixture, and these people whom you dehumanize and murder with
your American tax dollars and weapons, are just as likely to have the blood of Abraham, Isaac, and Jacob coursing through their veins, as any Jew from Poland, Germany, or Russia. Even Israeli rabbis and scientists admit this: