If the Palis really do fire a serious chemical warhead, and it kills a bunch of people and can be shown to be gas, then all bets in the middle east are off.
Of course, I'm quite immoderate on this issue - use WMD and cease to exist. Separate the men and boys from the women and children, transport the women and children to the antipodes and go to war on the men. No quarter fro those who do not unconditionally surrender. No more "Palestinian" problem.
You have my stamp of approval for what it's worth.
I still say that Iran has the bomb. They are and have been baiting Israel to attack. Iran will then nuke Israel. Iran doesn't care if Israel nukes it back. This is the whole idea.