The fact remains; no Middle Eastern nation wants Palestinian refugees, not for their genes, but for their politics.
Most states (talking about decision-makers, not populations) don't want to take in large groups of refugees, not because of their genes or politics, but because it has a cost and risks (in terms of integration, gov perception, fuelling far right parties, etc.). Nothing to do with Middle-Eastern/Palestinian.
Even though there are examples of massive refugee intakes by states, everywhere, including in the Middle-East, including of Palestinians, including voluntary.