Rand Paul kind of tried to get at the truth in his questioning of Clinton but he did a terrible job of it.
Best guess is Benghazi was a CIA and State Department operation to funnel guns to Syrian opposition through Turkey and that is why the whole Obama administration have been doing their best to cover it up from Sept 11.
There was a time when decent investigative journalists would have been all over this story since it involved a US Ambassador/possible CIA operative killed in action. The truth could have been uncovered by those willing to look. Now, those journalists don't exist.