Cuz I'm German and I know that it took decades of massive occupation and heavy, active deprogramming, for the Allies to civilize the Germans. Had to literally breed and propagandize the war out of them, which took nearly three generations.

Palestinians are even more warlike and resentful, and they have no memories of a high, advanced, peaceful civilization to fall back on, unlike the Germans. That's something that is fundamentally different between them and their neighbors. They're more like the Afghans or the Somalians.

Also, it's a region completely overrun by angry young men and women who breed like rabbits. That low of a median age, and that high of a fertility, means perpetual war. Either at home or abroad. I don't think there are any historical examples of such a demographic being peaceful.