On Dec. 31, just hours before a New Year’s Eve celebration, President Barack Obama signed the National Defense Authorization Act for Fiscal Year 2012. Section 1245 of the law contains language providing authority to impose economic sanctions on Iran in order to deter the ayatollahs from acquiring nuclear weapons.

White House efforts to have the sanctions provision stripped from the bill failed, and the measure became law with a quiet flourish of the presidential pen. Ever since, Washington and Tehran have been waging a war of words. None of this works to the advantage of the American people. Here’s why.