We have spent thousands of years raiding, killing, and enslaving each other. Our civilizations are built on the burial grounds of much older civilizations. We killed some of them. Others collapsed on their own. We have lurched from one apocalypse or war into another, pausing only to take a breath in between each one. Even the vaunted peace we forged during the interstellar race merely changed the battlefields. The Core Worlds were safe from war, but not our colonies. We continued to raid, kill, and enslave out there. We merely declined to report it in the inner worlds. Our greatest civilizations never brought true peace. We never treated our fellow man as actual human beings. Why did we ever expect aliens to be any better than us?