“Killing all American ambassadors and destroying all American embassies won’t quench our thirst for those who have attacked the sanctity of our Prophet”, al-Shinqiti states. Muslims should therefore not show sympathy for the American ambassador and the other diplomats killed in Libya, as many did, and neither should they call for non-violence, as other Muslim scholars have done. Instead, al-Shinqiti insists, the proper response to the film is “to attack [American] interests, to attack their security, to attack their existence and to attack their economy because this is the language they understand”.
It's only one fatwa by one person, of course. But the justification is out there, for jihadists needing any further goad.