I cant agree with you here. 2 were killed because of incompetence within the state dept when they denied the requests for additional security.
The other 2 were killed not by incompetence, but by negligence when the admin, or the Africa Command CG failed to get support to the mission. Before anyone even thinks about saying they didnt have time to get troops there, how would they know, while the fighting was still going on, how long they had to support those men and women? SOCOM had men less than 2 hours away, so did the State Dept security at the embassy. There is absolutely no excuse for not having additional boots on the ground within 7 hours.