Tom Toles drawing for the Washington Post put it quite succinctly.
Our Middle East Policy is disintegrating in the wake of the so-called “Arab Spring.” We hope to see a form of democratic government develop and replace the dictatorships and religious dictatorships that previously controlled the Arab states.
The outcome, so far, has been three or four more or less religious takeovers, scattered and lost anti-aircraft weaponry, loss of Soviet era chem weapons, and a Syrian civil war lasting nearly two years.
To that report, add four diplomats and ancillary staff killed by mob action in a planned assault upon several embassies and consulates. The supposed trigger this time is a 13-minute you-tube hatemongering session that mentions the name Mohammed in a fashion that is somehow insulting to a fictitious prophet.
The actual culprit remains to be identified. Mike believes it to be the action of radical Muslims bent upon conquering the U.S. I park my camel outside the tent of teavangelists who want to foment a new crusade, growing wealthy in the process. Your guess may point to another source.