Careful ... we do wander into the perverted thoughts in order to explain the perverted enemey.
Depending upon the interpretive skills of the reader, we must take the words at face value of having to face one with no redeeming qualities. Hence there is no voice that can be spoken that will affect the change of the individual bent upon murder or destruction.
Simply put, we take upon ourselves the burden of doing the unspeakable task of ending another human beings life in order to preserve and protect society.
Quit a large message for so few words.