The Obama administration’s just-released criminal complaint against the alleged mastermind of the Benghazi terrorist attacks provides a final contradiction to its own evolving explanations for what happened that day. The Justice Department’s indictment spells out a calculated conspiracy by Ahmed Abu Khatallah and associates to attack the U.S. diplomatic mission and CIA annex, which killed four Americans. The indictment might be viewed as a death knell for a theory that the attack resulted from a spontaneous protest against a U.S.-produced video. Now in custody, Khatallah was a commander of Ansar al-Sharia in Benghazi, a U.S.-designated terrorist group, and is himself...