"You Jews should be aware: You will never, but never have peace with Hamas. Islam, as the ideology that guides them, will not allow them to achieve a peace agreement with the Jews. They believe that tradition says that the Prophet Mohammed fought against the Jews and that therefore they must continue to fight them to the death." [from this article in Haaretz]
And since Fatah, just like Hamas, is based on Islam, "the ideology that guides them," and those in Fatah, too, are Muslims, with that Islam as "the ideology that guides them," this defector from the Camp of Islam might, had he thought more, or had more time, have noted that the Israelis cannot rely on negotiations, peace-processing, or any treaties with either the Fast Jihadists of Hamas (his main subject) or -- just as, or even more important -- with the Slow Jihadists of Fatah.
And that goes for any "agreements" with other Arab Muslims as well. For the awareness of an Arab identity, of sharing in 'Uruba, reinforces Islam. It is true that, now and then, other Muslims, especially those who have a long history of enmity with Arabs, and for whom they feel an ill-concealed contempt, such as many Turks and Iranians do, may be willing, to the extent that their ethnic identity, and its historical associations, plays against rather than reinforces Islam (which may be dimly discerned by some as the vehicle for Arab supremacism that, in fact, it is), to make alliances of convenience, out of temporary self-interest, with Israel (it happened with the Shah, it has happened in the past with the secular Turkish military).
But really, in the end it is the ideology of Islam, and not merely the particular embodiment of that in Hamas, that should prompt Israel to seek not "peace" -- it has the "peace" it is going to get, and should simply work to make that "peace" a little more "peaceful" not through any concessions or treaties, but through more aggressive action -- but to make sure that the only true and permanent and reliable peacekeeper in the region, the IDF, remains just as strong, as well-equipped and well-commanded, as it can be.