Joe, you seem to think that without the U.S. Israel would simply give up if invasion from its neighbors were imminent. We've already had at least two demonstrations that that's not true. Israel has nukes. If they were threatened with, say, Iran developing the ability to hit them with nuclear weapons what do you think they'd do? The other thing you have to understand is that Israel has more effective Middle East intelligence than has the United States and infinitely more effective Middle East intelligence than has Europe. Left on their own, Israelis aren't going to lie down and let the Arabs walk over them. They've been down this road before, in Europe. If a neighbor becomes an existential threat they'll take appropriate action, and the rest of the world won't like the aftermath.
I was at Udon Thani in Thailand in 1973, helping as best I could our attempts to prevent a bloodbath in Cambodia, when the Yom Kippur war broke out. Moshe Dyan, with his eye patch, stopped the invasion cold. A bunch of signs went up on the base with a picture of Moshe and the words: "Hire the handicapped."
If I were an Arab I wouldn't mess with these guys. When the Middle East equivalent of the Nazis come for them, the Israelis aren't going to go quietly this time.
Yeah ... so ... what's your point?
That Israel may may actually survive by using nukes, and then be berated and abandon by every other country, and completely fail and disappear due to attrition through lack of any interaction or support with other countries.
Or maybe they would use the nukes and somehow Benjamin Netanyahu (assuming he does not go to prison over the recent and credible accusations of corruption) keeps the international community at bay (highly unlikely with how most of the world thinks about the use of nukes currently) and the country does survive.
In either situation, the USA (and Europe) staying completely out of it only makes us look better to the rest of the Middle East.
Not to mention, Israel is only making matters worse. Being an apartheid state and unjustly engaging in military campaigns against an unarmed population is not really good for their image.
Last, I got news for you, Iran is the next major power in the Middle East. Nothing we can do will stop. As of matter of fact we only helped this by castrating Iraq. We best get use to Iran, because they are not going away.