 Third, one is said not to cause an evil such as a death when one’s acts merely enable (or aid) some other agent to cause such evil (Hart and Honore 1985). Thus, one is not categorically forbidden to drive the terrorists to where they can kill the policeman (if the alternative is death of one’s family), even though one would be categorically forbidden to kill the policeman oneself (even where the alternative is death of one’s family) (Moore 2008). Nor is one categorically forbidden to select which of a group of villagers shall be unjustly executed by another who is pursuing his own purposes (Williams 1973).