A pacifist is not really a pacifist if he is unable to make a choice between violence and non-violence. A true pacifist is able to kill or maim in the blink of an eye, but at the moment of impending destruction of the enemy he chooses non-violence. He chooses peace. He must be able to make a choice. He must have the genuine ability to destroy his enemy and then choose not to. - Yukiyoshi Takamura

A long winded way of saying much the same thing as Peterson.