[kbenson]

Morals are a intellectual shortcuts designed to help circumvent our natural proclivity for short term thinking over of long term thinking. As such, they change to some degree depending on the culture and society they arise in, to better suit the long (or medium, depending on your scale) goals of that society. Ancient Mongols were not immoral, fist differently moral than many of their contemporaries (and probably not as much as you would think), but that propelled them to the apex of human nations (based on what that meant at the time) for a while.