Like real life, really. People have a tendency to be dickheads from all walks of life. There is no intrinsically good or bad shade of skin, despite the craziness pushed in modern media and pop culture. White people have enslaved and have been enslaved, same with blacks, asians, native Americans, etc. There is no "noble savage" that's better than the rest, there are none righteous. Say what you will about the Bible, but it got that one right. "There is none righteous, no, not one."
People would probably do better to simply be good people to be around, and make the world a better place starting at home. Pointing fingers and categorizing people is what leads to division, cruelty, and oppression.