Or just trying to do their job. Their whole MO flies in the face of "good faith". Even when telling the truth, its always done so strategically. Like many foreign intelligence agencies, the CIA are the organizational equivalent of a sociopath and should be regarded as such, even by Americans.
I think a lot of CIA scandals over the decades do involve good faith, but also stupidity. They've sometimes been warped enough to think that doing obviously wrong stuff is good for the country and the world. The cold war in particular had a ton of this distorted thinking.
