They figure if they tell a lie long enough and often enough, people will believe it.
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Reuters is still blaming the YouTube video, Innocence of Muslims, for the attacks on the US consulate in Benghazi on September 11, 2012. This is from an article they published on Sunday, August 18, 2013:

U.S. ambassador Christopher Stevens and three other Americans were killed in Libya’s Benghazi in 2012 when Islamist gunmen attacked the U.S. consulate during a protest by a mob angry over a film they said insulted the Prophet Mohammad.

This claim, first made by then-US Ambassador Susan Rice on all Sunday morning shows, has been debunked many times. Here are a few examples:

October 9, 2012 – Under Secretary of State for Management Patrick F. Kennedy said the attacks in Benghazi were a coordinated terrorist attack. They were planned and organized.

October 27, 2012 – Libyan witnesses said it was an organized attack.

December 19, 2012 – Then-Secretary of State Hillary Clinton’s Accountability Review Board released their report on Benghazi and never mentioned a protest or the YouTube video.

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