And if you dismiss it as a "Zionist" organization, most of its sources are from the mainstream press (if you consider the NY Times and Washington Post "mainstream")
If you want to say Israel acquired the trans Jordan and gaza lands as a result of winning the war, that's good enough for me. But to argue who has the moral high ground in that one is, well, kinda like manifest destiny vs the injuns.
It tries to disguise the fact that Arabs have lived continuously in the land of Palestine - whether they called it that or not, whether it was an independent country or not - as the dominant culture for more than 1000 years. Whatever the faults of that culture - and we all know there are many - they preferred it to an imposed Zionist culture in which they would be the dhimmis. As early as 1891 they realized the nature of the coming conflict and tried to stem the massive Jewish immigration.
What we have is two incompatible cultures, each with good claims, fighting to control one small piece of land. It's a fight to the death - unless attitudes change far more than anyone believes possible.
Read Jabotinsky's writings, 1913-39, and Boris Shustaff (spelling?) who writes for Gamla (and others).
Why Israel Is The Victim And The Arabs Are The Indefensible Aggressors In the Middle East
The Myth Of The Palestinian People
-Ariel Sharon & Israel-- The myths of Sabra and Shatilla and the war in Lebanon --
-Online book debunking the "Sharon Terror story--
-Israel Arabs Palestinians THE BATTLE FOR TRUTH--
-Crash Course in Middle East History--
-Setting the Historical Record Straight--
Great concise explanation of 67 borders and UN res 242 here.