Of course he was NOT responsible.
Check it out:

Gregory Hicks is a whistleblower who was bullied by the Obama administration and effectively punished when he tried to tell the truth about what happened on-the-ground in Benghazi, Libya on 9/11/12. He was there that day working as a diplomat for the State Department, and later testified he knew from the beginning terrorists were responsible for the attack, and thus “immediately” informed his superiors. The Senate Select Committee findings last week, however, concluded that the attacks on the U.S. diplomatic facilities in Benghazi were preventable. But where does ultimate responsibility lie? The answer is obvious: