The answer is that the Obama administration won't come clean. It was caught flat-footed, proved utterly incapable of handling a crisis, and refuses to admit being wrong. It brought it on itself between letting Islamo-Arab terrorists take over Egypt after Mubarak fell and then letting the enemy escape once said enemy attacked. And attempts at exculpatory explanation by White House flacks run into the House Armed Services committee's conclusion that the Administration lied, specifically Leon Panetti, the area commander General Ham, and JCS Chairman Martin Dempsey.
Obama by any objective analysis was derelict in his duty and let the enemy escape, and has waged a Cover Your Ass campaign ever since.