The Israel lobby complex

A question to my many readers

I recently watched Hillary Clinton basically state that her administration would treat an attack on Israel as an attack on the United States. Charles Krauthammer makes a similar proposal in a column here. He is kind enough to give some reason as to why the US should assume this burden, specifically

it will be said, because Israel could retaliate on its own. The problem is that Israel is a very small country with a small nuclear arsenal that could be destroyed in a first strike. During the Cold War, both the U.S. and the U.S.S.R. created vast and invulnerable submarine fleets to ensure a retaliatory strike and, thus, deterrence. The invulnerability and unimaginably massive size of this American nuclear arsenal would make a U.S. deterrent far more potent and reliable than any Israeli facsimile -- and thus far more likely to keep the peace.

If I remember correctly, Israel has nuclear missile submarines, which would make a successful Iranian first strike unlikely.

The question is, does anyone seriously expect that Iran would be willing to gamble on a sixty percent change of annihilation, but not a 100% chance? Realistically that would be more like a 90% chance due to American political wavering, but let's call it 100% for arguments sake.

The obvious answer to this is "The Iranians are irrational" which is a claim not borne out be history. They've been quite skillful players of brinkmanship for years now. Evil and harmful yes, irrational and stupid, definitely not. Is there really that much value to pandering to the American fans of Israel?