If ethics must be held to in the face of the annihilation of everything, then I will proudly state that I have no ethics, only value judgments. Would I kill babies? Yes, to save the life of the mother. Would I kill innocents who had helped me? Yes, to save more. On an interesting aside, I would not torture an innocent for 40 years to prevent 3^^^^3 people from getting a speck of dust in their eyes assuming no further consequences from any of that dust. I would not walk away from Omelas, I would stay to tear it down.