It would maintain their honor. And, later, they might escape humiliating prosecution.
Wouldn't want to be a head on a political pike if you had nothing do to do with debacle, right?
"Why would Obama and Biden do such a thing? Because to launch a military operation against an al-Qaeda affiliate on the anniversary of 9/11 would have exposed the hollowness of their boast through convention week and the days thereafter — that Osama was dead and al-Qaeda was finished. And so Ty Woods, Glen Doherty, Sean Smith, and Chris Stevens were left to die, and a decision taken to blame an entirely irrelevant video and, as Secretary Clinton threatened, “have that person arrested.” And, in the weeks that followed, the government of the United States lied to its own citizens as thoroughly and energetically as any totalitarian state, complete with the midnight knock on the door from not-so-secret policemen sent to haul the designated fall-guy into custody." - Mark Steyn