The very nature of protests are to incite violence. When Arab Spring broke out in Cairo, small "How To Protest" booklets were found scattered around detailing burning effigies, burning flags, trespass, throw gas canisters back, etc. Someone very familiar with anti-Vietnam tactics obviously wrote the booklets in nursery school Arabic. Now compare the "naughty kids" in Cairo with the Benghazi attack.
And guess where they came from -- the American Left. Among others, Code Pink, William Ayers and Bernadine Dohrn were in Egypt for the months and weeks preceding the Tahrir Square demonstrations -- conducting "classes" on "How to run a demonstration".
During the Wisconsin recall elections, several "Organizing for Obama" personnel claimed they would create demonstrations and disruption "just like we did in Egypt".
The American Left is the nearest thing to a Communist Internationale existent today...