I have always thought (flame suit on) that the Palestinians had a legitimate beef with the Israelis over the settlements in Gaza and the West Bank and still believe that Israeli intransigence over removing those settlements are a major contributing factor to the failure of the various peace processes over the past 20-odd years.
That said, the world changed on Tuesday. The Palestinians rejoiced at the murder of between 10-30,000 absolutely innocent American citizens and foreigners here legally.
I have lost any sympathy I have ever had for the Palestinians' plight.
The ONLY American response that can work is to visit upon the terrorists who can be caught, and their families, complete destruction. Countries found involved should be dealt with peacefully: they should know and experience the same peace Carthage did after Scipio Africanus conquered the city: no one left alive to seek vengence, no two stones standing, salt in the earth.
Any so called legitimate beef the Palestinians "might" have had ended when they started organizing and sponsoring wholesale terrorism. There are far too many people in this world that believe that a justified act of war by the U.S. (e.g. removing iraq from Kuwait) is criminal, yet (them) killing unarmed citizens is proper. This idiocy has permeated liberal america as well, although to a lessor scale.