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The connections between McCain and the Benghazi families is definitely of note. Especially if he were somehow involved in the murder of American servicemen.
But the operation wasn't about democracy, nor just oil (although that's a bonus). They seized Libya's gold, prevented an African Union currency on a gold standard, open up Europe for the Kalergi Plan invade, emptied Ghaddafi's armories (and hired mercenaries) to start the Syria "civil war".
It was about a lot more than oil.