Argument: Turkey is already a member of major Western/European organizations
"Turkey’s Membership Application: Implications for the EU". Jean Monnet/Robert Schuman Paper Series. Vol. 5 No. 26. August 2005 - At the same time as being located next to politically unstable areas, Turkey is a member of virtually all of the major western and European organizations, with the exception of the EU: the Council of Europe, the Organization for Security and Cooperation in Europe (OSCE), the Organization for Economic Cooperation and Development (OECD), and – most importantly of all - the North Atlantic Treaty Organization (NATO). As such Turkey already is, and as an EU member would have even greater potential to be, an important bridge between the West and countries currently on the margins of Western influence.