Concerning the Spanish: in the end they made Reconquista, they drove out the Mores. And instead of the relative tolerance came inquisition, forced conversion and the expulsion of Moslems and Jews. Jews who had lived in prosperity for centeries before under moslem rule. Concerning the Byzantines: In their 1000 long history they had periods of war, and also periodes of peace with different moslem powers. When Saladin retook Jerusalem on the Crusaders, they sent him congratulations. Indeed, in the end the Byzantines were subdued. They were subjugated, but not slaugthered. For many of them, the one potentate was just replaced by another. Concerning the crusader kingdom: The Crusaders lost the battle at the Horns of Hattin. In a war started because one of the crusaders couldn't keep his hands of the caravans with pilgrims going to Mecca. The crusaders lost because of military stupidity. Not the first case. Years earlier they had attacked Damascus, their only ally in the region, and were repulsed by Nur-ed-Din. Saladin was victorious at the horns of Hattin. He retook Jerusalem. And, unlike the crusaders, he showed mercy and magnamity. So, history doesn't prove your point.
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from the article: Mideast peace needs prophets, not yes-men