Iran has dramatically escalated its rocket attacks on American military and government personnel in Iraq. The Biden administration’s caution against retaliation is emboldening, rather than cooling, this crisis.

On Wednesday, more than a dozen rockets struck a major United States-operated Ain al Asad air base in Anbar province. The U.S. Embassy and a U.S. government facility in Erbil were also targeted. The U.S.’s response?