TBH I've got no intention discussing history of US-Turkish relations since Trojan war. IMO Iraq war is as justified as Turkish raids over Northern Kurdistan. If Turkey bombs/occupies territory of another state as a response to its citizens' deaths, then US has the same right to bomb/occupy territory of another state as a response to 9.11. Going back to OP: intelligence matters is a matter of trust. MIT is under direct command of Turkish PM. You know, the same man that just 2 years ago was the best buddy of all anti-US "talking heads" from Morales and Chavez to Assad and Ahm-jad. Warm meetings and invitations to Istanbul to Hizbollah and Hamas leaders. The first one is directly responsible to deaths of 240 US marines , the second one response to OBL death was "We condemn the assassination and the killing of an Arab holy warrior". The head of MIT is Hakan Fidan, a man personally appointed by Erdogan. Fidan's security achievements prior to appointment was being a deputy undersecretary at the Erdogan's Prime Ministry. This man is a frequent visitor to Iran ( probably personally handling IMAGES of PKK/PJAK bases to Iranians ). As Washington Post coins him : "Fidan is said to have close relations with Qassem Suleimani, who heads Iran’s Quds Force and is probably Khamenei’s closest adviser on security issues."