Auferre, trucidare, rapere, falsis nominibus imperium; atque, ubi solitudinem faciunt, pacem appellant.
Translation: To ravage, to slaughter, to usurp under false titles, they call empire; and where they make a desert, they call it peace. Oxford Revised
We only teach peace by peaceable means. We only create positive peace by peaceable means. Justice cannot be achieved by violence without then creating the conditions that will produce the next act of 'justice' in reprisal. Already we see 80 dead from a bomber in Afghanistan, with the Taliban claiming it an act of revenge for killing Osama bin Laden.
Humankind can evolve past this, but only by connecting the heart to the cerebral cortex and disconnecting it from the limbic, the lizard revenge lower brainstem. This can only be done consciously. It is not intuitive nor instinctive for most of us and without reason we will continue our slide.