My take is that Stevens knew too much and the decision,political of course, was made by those in the regime like axel, jarrett and moochhell.
Stevens had to go. He went all the way back to the bath house days with Rhambo and zero.Now he was a loose cannon with contacts all over the mid-east. He talked to them in Arabic.The regime never knew exactly what he was doing! He had to go.
First they got rid of his security left him with only locals denied all his security requests.
By the way when these security requests from Stevens were denied Hillary and Petraeus at CIA were slick enough to forward Stevens requests for more security to the regime and kept copies for their files absolving them if the shiitte hit the fan later. As it did.
Once Stevens' security was gone and he was left with local security they were quickly compromised. They told the terror types where Stevens was and the rest as they say is history.
Fall guys will be Hillary and Panetta. By the way is this retribution by Jarrett for their hit of obl without her knowledge? Could be.