Like a giant dose of salts to a bloated and constipated patient, “Cablegate” has scoured its way through the post-9/11 United States empire, exposing its internal workings to merciless scrutiny: In Iraq, U.S. forces and their Iraqi subordinates kill civilians and journalists while their commanders turn a blind eye to sickening acts of torture and murder; in Pakistan, U.S. special forces patrol “se