That post assumes that the US would only use nuclear weapons if they were military necessary. Do we have any reason to think that's the case? There might be political reasons to use nuclear weapons, too:
"If the Iranians do not back down and the US actually drops the bomb on Iran, a moral and political line will be crossed which has held since 1945. The US will be able to hold the threat of nuclear attack over every country which does not already have strategic nuclear weapons targeted on the US. The authority of the US military will be reasserted, and what happens in Iraq will become unimportant to world politics."
From: http://www.cpgb.org.uk/worker/593/anti-war.htm
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"Boredom is the threshold to great deeds."
-- Walter Benjamin http://huh.34sp.com/ --------------------------- tim_boetie at fastmail.fm