Jason Pack and Andrea Khalil in Monday’s Wall St. Journal. Written in Benghazi, Libya– September 11th now signifies a national tragedy not only for the United States but also for Libya. The killing of Ambassador Christopher Stevens in Benghazi during last Tuesday’s attack on the U.S. mission has upset the delicate political transition from dictatorship to democracy that was unfolding here in Libya. It also has obscured parliament’s prudent selection last Wednesday evening of Mustafa Abushagour—a moderate Islamist and respected technocrat—as prime minister. Yet spontaneous street demonstrations throughout the week denouncing the attack and seeking to pressure the government to act against its perpetrators suggest that Libyans are determined to build an inclusive society, free from fear. On Wednesday night …