On Sunday, the White House narrative on the assassination of Ambassador J. Christopher Stevens and three other Americans in Benghazi was that they died in a protest that “spun out of control,” as UN Ambassador Susan Rice insisted on multiple talk shows. That narrative hasn’t even lasted out the week. By Wednesday, officials in the US government began acknowledging that the so-called “riot” at the consulate in Libya had elements of planning and heavy weapons; by yesterday, Barack Obama himself refused to answer questions about the nature of the attack. There may not have even been a protest at the...