I don't really post much here at all, but this comment caught my eye, because your claim is that because they're the top spy agency in the world they're supposed to be smart.
The CIA and the former KGB were considered the best spy agencies in the world for their time. I don't really know who cast that vote, but that seems to be the consensus a lot of people have. Perhaps it's just mindless brainwashing by the United States civilization. The KGB is no longer in existence and was replaced by the FSB. I haven't really heard anything promising about the FSB, thus pretty much leaves the CIA as the premier spy agency in the world.
Perhaps there are other which are better, I've heard good things about the Mossad and SIS (aka MI6), but I'm not sure if they really are better or not. Nor will I ever actually know. For arguments sake let's say they're about on par.
That having been said, I direct you to this link.
https://www.youtube.com/watch?v=0qRrAkIXYn8
I'm not really a fan of MSNBC, or this woman, but she did the homework and gathered a lot of examples to make a point, thus saving me the trouble of doing so. (You really don't have to watch it past 8 min if you don't want too)
Her point being, that these people who are supposed to be really smart aren't really as smart as we give them credit for. Really when you get right down to it they're glorified cops who have a lapse in judgement just like anybody else, and honestly if you're not a dee dee dee, and have a clean record, you could make it into the FBI or the CIA if you really wanted too.