You might well be right, I only have the few facts that I have and rumors and so on, so you could be right, perhaps I don't see that Israel is in a worse predicament than I thought.
What is the risk of a nuclear war here? You say the US must prevent a nuclear war but how can that transpire when Israel alone has nuclear weapons? A nuclear war means more than on belligerent has nuclear weapons, that's not the case here.
I don't think the US would go to war with Iran, it doesn't need to if Israel uses a tactical nuclear strike to reset everything, Iran will have to desist because it cannot counter a nuclear attack.
The US could sit back and "watch" so to speak, secretly aiding and assisting Israel, but would pretend to want to reduce friction but behind the scenes just look the other way as Israel strikes, nobody, not the US could ever attack Israel.
This does sound a little dramatic I admit, but if there's one very important thing to understand here, it's that Israel is reckless, it has always been reckless and the nature of the regime is very right wing. The Israelis do not listen to anyone, they truly live in a world where they are so special, so important and so divinely protected that nothing is beyond them.
Amihai Eliyahu even hinted at possible nuclear destruction in Gaza in Nov last year, these people speak this way because they are that way, other than possibly Russia has any other nuclear power ever had an elected official make anything like such statements about the viability of using nuclear weapons on a civilian population?