Why? To buy back stinger missiles from terrorists that we had originally given them.
Check it out:

It has been nearly a year since the attack which killed four Americans in Benghazi. During that time various minute-by-minute accounts of the attack have been published. In addition, the administration’s decisions to refuse additional security requests and to revise its talking points after the attack have been examined in detail.

But Benghazi may be a case where most observers have missed the forest for the trees. This is not an attempt to add new information so much as it is to collate the information that already exists from the most reputable journalistic sources.

To begin with, Benghazi was a CIA operation involving weapons, one which had no cover beyond a small mission that provided a diplomatic fig leaf for the effort. Officially the CIA was there to track and collect dangerous weapons left over from the war that ousted Qaddafi. But the evidence suggests the CIA was also either tacitly or actively involved in a multi-national effort to ship those weapons to Syrian rebels. Our covert effort in Benghazi, Libya was connected to our escalating involvement in Syria.

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