No one seems to raise the concept of the diplomatic mission's, relative success. A lot of Libyans were outraged over the attack. It was probably organized in advance, and then reported out as a response to the video. State Department had offered extended security, which the embassy may or may not have wanted to have extended. The ambassador died in a local hospital, apparently among Libyan, U. S. Friendlies. and likely their were friendlies involved at the compound. The surprise is that before and after, there was no image of "Ugly America" raised in the population, or the Mideast.
The U. S. presence was not a catalyst for multi-national, regional outbreaks of regime change by Al Queda, or the like. The incident can be faulted as being regrettable. The several months of diplomatic presence would likely better be remembered a high point, for the USA, in the region.
"Crow, James Crow: Shaken, Not Stirred!
(Even modern textbooks, fail to note real motivation for European colonization: Multiple Acts of Fornication with indigenous peoples, on Lands of Many Nations(?)! Immigration always a well-understood concept, in all of history(?).)