The Arabs, Iranians, Turks, Europeans don't care squat about the Palestinians nor does the American left.. If they did the Palestinians would have been settled in their own homeland decades ago. There are many many empty miles out there that could have accommodated them.
But the Palestinians are used by all as justification to hate and kill Jews. That's it. Once the Jews are gone, the Palestinians can be damned. Nobody will give them a second thought. The only reason the American left would take them is to further weaken America which most of them also hate.
And, if the Palestinians should all be somehow teleported out of the region so that they were no longer a factor there, the Arabs, Iranians, Turks, Europeans, leftists in America would still hate the Jews in Israel and want Israel to disappear.