In Greek mythology, Sisyphus the king of Ephyra is condemned by the gods to painstakingly push a huge boulder up a hill only to have it roll down once he reached the top. To add to his misfortune, he was doomed to this laborious task for eternity.The run-up to the 20th anniversary of the September 11 terrorist attacks has a tragic Sisyphean tinge to it. On August 26, bomb attacks outside Kabul airport killed more than 100 people, including 13 US military personnel. Many more were injured.The…