An interesting observation by Glenn Grenwald:

 

"Terrorism has no objective meaning and, at least in American political discourse, has come functionally to mean: violence committed by Muslims whom the West dislikes, no matter the cause or the target. Indeed, in many (though not all) media circles, discussion of the Oslo attack quickly morphed from this is Terrorism (when it was believed Muslims did it) to no,this isn't Terrorism, just extremism (once it became likely that Muslims didn't)."