Well no, according to you it should never be an issue, apparently.
But take each of those attacks and tell me: Did any of them last 7 hours? Did the Bush administration turn down added security requested by the ambassador prior to the attack? Show that they were actually similar rather than ust lazily spit out a hollow inforgraphic.
I will save you some time. The biggest attack that cost 16 lives lasted 20 minutes and was carried out by Islamists disguised as police officers. The second biggest (Karachi) was caused by a fertilizer bomb in a truck.
So that is two that offered no chance of a rescue.