It seems that the US has redefined the meaning of  word self defense. Look at this statement which came out after the last weeks news of  Obama uh… sorry! Osama raid in Paksitan
Obama’s spokesman Jay Carney said while discussing the Osama kill. “There is simply no question that this operation was lawful… We acted in the nations self-defence.”
via Post-raid, US & Pak engage in sabre-rattling – The Times of India.