'The Justified Infliction of Unjust Harm'

I develop a distinction between the justness of inflicting a harm and the justness of the harm itself. I use this distinction to argue that Victim is permitted to inflict lethal harm upon Mistaken Threats: characters whom Victim justifiably, but mistakenly, believes pose a threat to his life. Since Victim cannot distinguish Mistaken Threats from Genuine Threats, whom Victim is permitted to kill, a theory of permissible defence can be action-guiding only if it grants identical permissions in both cases.