The Iranians don't want the same thing we do in Iraq, not really; they want to control Iraq... the Ayatollah hates the United States; the Iranians are enemies of the United States.
In most cases, cables are marked secret not because the U.S. requires it but because those speaking to us - the foreign leaders across the table - do. They are not keeping secrets from us, but from two other groups: their enemies and their subjects.