Argument: Turkey's EU membership would help liberalize/stabilize the Middle East
David L. Phillips. "Turkey's Dreams of Accession". Foreign Affairs. Sept/Oct. 2004 - Summary: The hope of joining the EU has driven major reforms in Turkey, including economic liberalization, human rights protection, and greater civilian oversight of the military. But these reforms have fueled suspicions among Islamists and hard-line army officers. EU membership would help Turkey become a successful Muslim democracy, strengthen it as an ally in the fight against terrorism, and foster liberalization in the Islamic world.
"Turkey’s Membership Application: Implications for the EU". Jean Monnet/Robert Schuman Paper Series. Vol. 5 No. 26. August 2005 - Turkey’s strategic political and security position. Turkey occupies a key geopolitical position. It is physically located close to, and has considerable influence in, the Balkans, the Middle East, the Eastern Mediterranean, and several states of the former Soviet Union. A stable Turkey within the EU could have a stabilizing influence within this conflict-prone neighborhood.