just assassin

is one who knows that he can't do what he has to do and finally does.

The moral drama in which this redemption is played out is familiar to existential philosophy. 'A morally strong leader,' writes Walzer, 'is someone who understands why it is wrong to kill the innocent and refuses to do so, refuses again and again, until the heavens are about to fall. And then he becomes a moral criminal (like Albert Camus's 'just assassin') who knows that he can't do what he has to do and finally does' (p. 45). (Walzer in Asad 2007 : 18)

just assassin, n.All

just assassin