The Arabian government will not help them because they are in bed with the Americans. The Jordanians were denounced by Hamas and thus will not help the Palestinian people. The Israelis lie to the East and control Palestine, they do little to help. Afghanistan is a wilderness, and those who did help the Palestinians (bin Laden etc) have been decimated, which ironically gave rise to the ever more extreme Islamic State. The Lebanese are in similar state. The rest of the countries are either destabilized, puppet governments for the US or heaving with IS or Taliban. You can thank the Americans for making a lovely little mess in this part of the world.
As for your second point, the Palestinian peoples rejected help from the governments of Saudi Arabia, Turkey, Syria, and Jordan in the 1920s-1930s, when they launched massive terrorist campaigns against those governments. However, since the fall of the Ottoman Empire, the King of Jordan, descended of Suleiman the Wise, Sultan of Egypt (I bring that up because through Medieval constructs of politics the King of Jordan is the rightful King of Jordan) was the sovereign of the Palestinian peoples. He became their spokesman in the United Nations and to Great Britain during their control of the Holy Land. When Israel became a nation, the King of Jordan again acted as the leader of the Palestinian peoples. However, in the late 1960s, after the Six Day War, the Palestinian peoples were convinced by leaders of Black September, the PLO, and the first foundlings of Hamas and Fatah to petition the King of Jordan to relinquish his claim as sovereign over the Palestinian peoples. The Palestinians were led to believe that if given their own nation, the King of Jordan would claim their lands as his own, thus depriving them of their own land. The Palestinians petitioned the King and as a good and gracious sovereign, he relinquished his claim. From that moment on, the Palestinian cause for their own state has been led by terrorists or semi-peaceful warlords. These are not the building blocks of a nation, but of anarchy. With Gaza and the West Bank separated, one side is under the control of Fatah and the other Hamas, there is no Palestinian unity.
Osama Bin Laden did not support the Palestinian peoples. He believed they were a mongrel race of people best suited to "serving the cause and no more". Bad example.
Also, realize three things:
First, ISIS did not come out of nowhere, it has always been their in the hopes of the return of the Caliphate since the first one fell to Kublai Khan's Mongol Empire, and the second fell to Salah al-Din with aid in its weakening by the First Crusade.
Second, if al-Baghdadi is who he claims to be
(the direct descendent of Hussein and therefore the True Caliph), his family has moved through the political schemes of the Arab world for almost 800 years.
Third, ISIS is born of a long standing tradition of terrorists, an offshoot of al-Qaeda, trained with Hezbollah, AND is killing off those groups who dare pop up in their territory. ISIS is hell bent on domination, not liberation.
Finally, you can thank every major power of the last 2000 years for leading us to this moment, not the nation that is less than 300 years old. How about England, Turkey, Greece, Rome, Germany, Egypt, the Khanate, Russia, and many many more world powers that have played their politics in the Middle East?