Why was the National Security Council's Gülen decision not implemented?

The work of the commission set up to investigate Turkey's July 15, 2016 coup attempt reveals that state institutions considered the Gülen brotherhood a threat in the past and had made warnings. However, when it came to implementation the Justice and Development Party (AKP) government did not take these warnings seriously, allowing ample room for maneuver for the movement of U.S.-based Islamic preacher Fethullah Gülen.

We can start with the written answer sent to the commission by Necdet Özel, who was Turkey's chief of general staff from 2011 to 2015. With regard to the state's evaluation of the Fethullahist Terrorist Organization (FETÖ)/Parallel State Structure (PYD) threat, Özel divides the past into three periods.

The first period is the time up to 2010. During this period, all religious brotherhoods were considered a threat to national security by the state as they are seen as groups that abuse religious values. The Gülen brotherhood was seen as a threat within this framework. Özel says that of the 1,166 dismissed from the Turkish Armed Forces (TSK) in those years, 400 were related to Fethullah Gülen.

In the second period that started after 2010, the state's evaluation of the perceived threat had changed in its official documents and the Gülen movement's activities were no longer seen as posing a security threat.
"To my recollection, no action was taken against suspected Gülenist personnel during that period," says Özel.

Now let's look at the statements at the commission from Özel's successor, General Işık Koşaner. One of the issues that came to the agenda while he was answering deputies' questions was the fact that the Gülen movement was taken out of the National Security Council's policy document listing threat priorities ...