Perhaps they prefer to propagate the fiction of peaceful Islam, as a way of jamming the Salafist message of intifada in the West and jihad in the Moslem world.
Islam has not always and everywhere been violent, as the essay pauses to allow Khadduri to say before going on. Indonesia and East Africa are two examples. Khadduri himself was nearly persuaded, in the 50's of the Arab Nationalists, that there was another way forward for the old Moslem societies. It was the Arab states' failure to expel the Jews of Israel from the Hijaz, their utter prostration, denudation, and final defeat in the Six Days' War of 1967 that opened the door to the throwbacks.
This has always, but always, been about the Moslems' uncontested (except by Israel) assertion that nobody but they could erect a state in the Holy Land -- never mind that the British and French took the whole region from the Turks and owned it outright in 1919 by right of conquest.
Any cult that will kill you if you leave it is manifestly a violent cult.
With respect, I don't believe that the examples of Indonesia and East Africa as examples of benign Islam stand up to scrutiny. The East Timorese have certainly had trouble enough with their Islamic neighbour. I'm not up on 19th Century East Africa, but the Mahdi's army that sacked Khartoum and was later destroyed by the British doesn't support a picture of peaceful East African Islam
Islam is pretty much the same fanatic deathcult everywhere. Nor should we allow that its remotely Israel's fault that the hardliners are gaining ground - death and jihad are hard-wired into the Quran and ahadith.