“Gross incompetence”
Wrong.
Hillary planned the attack.
I very strongly suspect either she, ValJar/Obama or both also commissioned the "video". Walid Shoebat (former terrorist converted to Christianity) says that the "Christian" movie producer is a muslim and definitely not Christian. Hillary is very close to the muslim Brotherhood through her gal pal Huma.
Ask yourself how the people who act like they didn't see the danger actually knew about this obscure, ridiculous video on the internet with almost no hits before the incident occurred.
There is speculation that the Ambassador was to be kidnapped and then an exchange made for the blind sheik. Some there (I don't know the names) have said that when the attackers got fired on, they yelled, "Morsi sent us!" It would explain why they didn't want the attack interfered with.