'How is it determined that these Arabs have any rights to squat on the land in question?' Your argument here contains the implicit claim that the 'Arabs' came from somewhere. That, largely, is false. To a considerably greater extent than the 'Jews,' the 'Arabs' are the physical descendants of the people who have always lived in Israel -- and certainly of those who lived there in Biblical times. Neither group likes the idea, but genetically, at least some of the 'Arabs' are probably more Jewish than the 'Jews.' They merely failed to keep faith, so to speak. This in turn reduces your argument to a matter of accepting the Old Testament, and only the Old Testament, as the source of revealed truth. Not many people are on that bus.
Yemen's Houthi rebels commit to peace plan in letter to UN chief, BBC reports (Haaretz)
from the article: Israel sees court rulings on Palestinian land as mere 'recommendations'