Here is the most plausible story:
The CIA didn’t know or didn’t realize the attack was an orchestrated terrorist attack and that is why they didn’t ask for or send in backup.
The cover-up is the government, Administration, Sec.Def., CIA, covering up the fact that they were totally fooled (and incompetent) in mistaking this coordinated attack as a mere political demonstration.
What we don’t know is where Rice got the information that this was all caused by the silly video. So, lets look back at what I said about Psi-Ops.
The most logically implausible story is the one Rice told about the video being the cause, but emotionally it is the story everyone wants to accept as plausible.