I think you miss the ultimate implication of Obama’s absentee approach to the Benghazi crisis. In his stead, all of the decisions were made by Valerie Jarret, who is constitutionally ineligible to give such orders.
That is what they are trying to hide the most, in addition to the fact that this was likely to have been led out of Egypt, with the unproven but interesting conjecture that the intent of the attacks was to stage a hostage swap between Ambassador Stevens and the blind sheik in holed up in a US prison.
That would NOT have made Obama look good. It would have made him look weak and pathetic.
Plus it would be open season on kidnapping MORE ambassadors.