I agree, but unlike you, I never mind making wild speculations and wearing my tin foil hat...lol. Here is one....the reason the FBI is not being allowed in is because the weapons used in the attack were furnished by the Obama administration and wound up in the hands of the terrorists. The ambassador was furnishing those weapons on orders from the administration and now they have a huge blowback on their hands and four dead Americans. Obama can not have the truth coming out before the election and may even be willingly involved in arming the Islamists IMHO. The man does not have this country’s best interests at heart.
...He spent most of his career in the Middle East and North Africa, including postings to Israel, Egypt, Syria and Saudi Arabia, in addition to serving as the deputy chief of the U.S. mission to Libya from 2007 to 2009, during the rule of Moammar Gadhafi, according to the State Department.
In May, one year after arriving aboard a cargo ship to work with those involved in the upstart rebellion, Stevens was appointed U.S. ambassador to Libya
I think you are very likely correct. A Libyan “Fast and Furious”.