One difference between the two cases is imminence. Able engages himself in the immediate defense of the child; he has no intent but to defend that child; he has no separate intent to harm or kill the abortionist. Recall that, in justified self-defense or defense of others, the intent cannot be to kill the aggressor, but rather to stop the attack Baker, by contrast, is not in the heat of a physical struggle to save the child. He thinks, “I can get no closer than this. If I do not stop him he will go in there and murder babies. So I will shoot him in the head.” His purpose or motive is to save children. But his intent in the act he performs that moment is to blow the baby killer’s head off in order to achieve that purpose of saving children. Apart from the just war, capital punishment, or the justified rebellion, which derive from the authority of God, no one may ever intentionally kill anyone. Baker is intentionally doing an intrinsically evil thing to achieve a good end. He assumes the authority of God, to decide when that person will face the final judgment of God. His act cannot be justified. St. Thomas, quoting St. Augustine, said that " ‘a man who, without exercising public authority, kills an evildoer, shall be judged guilty of murder, and all the more, since he has dared to usurp a power which God has not given him’ ” (Summa Theologiae, II, II, q. 64, art. 3).