Just having read the Violinist story in my Philosophy class, can't you argue, from the author's perspective, that killing 1 random person, in order to save 10 is an unjust killing? The 1 person is not obligated to sacrifice himself in order to save 10 people, you cannot take away that person's choice, and force him to be altruistic.
If it was a situation of lets say 1 person falling on the left side of a building, and 10 falling on the right and as a super hero you could only go one side, then it's not really a "sacrifice" because all 11 were doomed to die anyway.









