Personally, I wouldn't be surprised if some type of operatives were used to "seed" the situation.
I have a feeling Ambassador Stevens had info on how much money Libya had and was working as liasion with the new government to keep track of it,
I think Amb Stevens was taken out by the terrorist soldier of fortune that Holder released from Gitmo to clean things up
Now they need to clean up that little mess and thats what this is about [/plausible consipracy theory]