Focusing on Blackwater while neglecting MPRI is like investigating Ivan Demjanjuk for years on end, but allowing Adolf Eichmann to live peacefully in Buenos Aires. Up to 17 Iraqis were killed on September 16 by mercenaries working for the security company Blackwater USA, in what Iraqi and some U.S. officials say was unprovoked murder. Earlier this week two Armenian Christian women were killed by Unity Resources Group hired guns. A devastating report by the House Oversight Committee accused Blackwater of acting like murderous cowboys, but the firm still operates with impunity—unaccountable under either U.S. or Iraqi law. Yet while exposing...