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Palestinians did not even exist until they were "invented". Prior to 1967 they were "Arabs". Genodical Arab nationalism was not born 70 years ago but earlier. Its seeds are within Arab Nationalism that formed the Muslim Brotherhood in the mould of the European fascist movements. It filled the vacuum left by the decline of the Ottoman Empire and the move of the Turks culturally westwards---- dumping even the Arab Script for German. In the 1930s the MB gravitated towards the dream of a Caliphate and in 1936 declared war against secular Muslims and and ALL non-Muslims. Within this war it aligned itself with Germany. In WW-II the MB helped even recruit SS fighters. The start of the demonization, I think, I'd place a bit earlier.. in 1920 with the Nabi Musa Riots. After the riots trust between the Arabs and Jews eroded significantly. The Jaffa Riots of 1921 did not help.. And the Hebron Pogrom of 1929-- the Mulfti (a member of the Brotherhood) called for killing Jews following a dispute over the use of the Kotel (Wailing Wall)-- which ethnically cleansed the city of Jews until after the 6 Day War (at first the British evacuated the Jews "for their safety" and then refused to let them return to their homes. After the 1949 Armistice, Hebron was on the Jordan side so continued to be closed to Jews).

This is classic hasbara though - there's no point trying to de-legitimize either peoples' claim to the land, because the fact is that both populations believe it. There's no chance of progress if we're only looking backwards.