Arabs aren't some evil rapist monsters.
...while the Hutus are?
2, even if things DID degenerate to such a situation, which I find extremely unlikely, the USA not 3 years ago finished beating the shit out of an evil fascist regime that tried to exterminate Jews. What do you think their response will be to even a hint of someone attempting to exterminate a bunch of Jews?
More likely, one of two things happens: The US steps in and mandates that the Jewish forces sit down, shut the Hell up, and let the Arab majority run the damn useless marshland; or, the Soviets make flexing motions and the US doesn't have enough nukes ready to deploy yet, so the US evacs the Jewish civilian population and says "hey, we're, uh, ending immigration quotas for Jews, come here and you're all cool with us, OK?"
You have an extremly rosy view about how ethnic cleansing works,or how much worth of any goodwill of the west was when shit hits the fan. the yews didn't believe it would save their hides,and considering what utter disgrace the western actions were before,during and after the holocaust they were probably right about that.