War

There is only one final justification for going to war. VICTORY. Else, stay out of the fray. War is a nasty dirty mean business. You break things and kill people. In war there is only one rule of engagement. Kill the enemy before he kills you. Any thing less and victory will elude your grasp. Victory has to be achieved before there is peace. Nation building, social justice, humanitarianism, etc. are feign reasons for going to war. World War II is the last time we were actually victorious over the enemy, and actually achieved peace. You can not achieve peace with an enemy sitting as your equal eager to spit in your eye, or more likely slit your throat.