I thought "Batman Begins" had the right balance, where he says to Ras "I won't kill you...but I don't have to save you..."
exactly. though saving the joker is just silly. and not going for a fatal blow to save a life is silly, and kind of immoral. after all the people joker has killed or terrorized, his ability to mass murder with little trouble, and his ability to always get out of jail or even kill from jail. and i do think superman should kill sometimes. with all those mountain-shattering punches it makes no sense that no one ever dies in a knockdown fight with him.
