> months of military provocation by Syria
The Israelis were also incredibly provocative, constantly raiding neighboring Arab territory. Israel had a history of aggression against the Arab countries, such as its invasion of Egypt in 1956 and its numerous raids into Jordan and Syria.
> Had the Six-Day War (and then the Yom Kippur war, which was, like the Arab-Israeli war that preceded the Six-Day War, unquestionably a war of aggression by a coalition of Arab states against Israel) not happened, the cause of Palestine would be directed instead at/against Egypt and Jordan.
There are many false assumptions and representations here. First, the Palestinian cause was directed against Israel because Israel is the country that expelled the Palestinians from their homes, not Egypt of Jordan. Whatever complaints the Palestinians had against the Jordanians or Egyptians, those countries had not kicked them out of their villages and expropriated their homes.
Second, the First Arab-Israeli war was not a war of aggression by the Arabs. The declaration of Israeli independence was effectively a declaration of war on the Arab world. The Arabs could not accept European colonists (which the founders of Israel were in their overwhelming majority) establishing an ethnically exclusive state on Arab land. The Arab-Israeli war was preceded by massive expulsions of Palestinian Arabs from their homes by the militias that would later become the Israeli army. From the Arab point of view, the war was a defensive war against foreign colonists intent on conquering Arab land and on expelling the Arab population.
The Yom Kippur War was indeed launched by Egypt and Syria, but its aim was to reclaim Egyptian and Syrian territory that Israel had militarily occupied since 1967. At the time, the legitimacy of Egypt and Syrian aims in that war were widely recognized by the international community, which had already called on Israel to return the territory to its rightful owners.
> "From the river to the sea" implies, among other things, the dispossession of Israeli Jewish people outside the West Bank and Gaza.
Most people who use the phrase view it as a call to turn Greater Israel, which already exists in practice, into a fully democratic state with equal rights for all its inhabitants, including the Palestinian population of the West Bank, East Jerusalem and Gaza. This does not imply any dispossession of Jewish Israelis, any more than the end of Apartheid in South Africa implied dispossession of white South Africans.