Will the US attack Iran soon ?

[Хahar 🤔]

We cannot aid in a preemptive war. Never.

[Хahar 🤔]

We cannot aid in a preemptive war. Never.

The United States already did. It was called the Six Day War.

Doesn't make it right. American foreign policy has had innumerable failings.

[Хahar 🤔]

No.  I wouldn't rule out Israel attempting to knock out Iran's nukes, though. 

If they do that, it may lead to war, which means the US will get involved (hopefully).

Why hopefully? If Iran's mythical nukes are guaranteed to be nonexistent, it's no threat.

True, but if the US gets involved, then we can put a permanent end to the Iranian threat.

which as of now doesn't exist. So it's kind of hard to put an end to it.

I do think Iran poses a threat, and we can end it.

But so does France.

[Хahar 🤔]

Then, I still wait someone to explain me in the name of which principle US should absolutely defend Israel,

Because we fear what might happen to the 5.5 million Jews that live there if we don't.  They do have a handful of neighbors who have repeatedly attacked them and have claimed hundreds of times that they won't be happy until every Jew is gone from the Middle East.  We ignore them at the Israelis peril.

[insert comment about the Jews getting shoved into Israel without regard for the natives]

No, of course not.  We shouldn't unconditionally support anybody.  If France invaded say, Mexico, we wouldn't back France (unless they had a really good reason).  If Israel got a hair up it's ass and took the Suez Canal back, I don't think we should (or would) support them.

We wouldn't back France, of course. France-hating is too prevalent in America. But we would back Israel in they decided to take the Suez Canal or Lebanon or even Jordan.