Them Samurais know damn well that being Guard means putting your life on the line. You can't demand to be innocent if you're risking your life in the first place. Now if a Guard tried to avoid fighting Sasuke, that guard is innocent.So it doesn't matter that a criminal came to a diplomatic meeting, aiming to kill on of the members of the diplomatic meeting? The samurai are still guilty because they upheld the peace of the meeting?