You are showing your racism and sexism.   Some of those evil white men also did quite a bit to promote women and people of color.  Did you know that there were black slave holders that were worse then white slave holders?  Did you know that it was mostly Africans that captured other Africans to fuel the slave trade?   A number of 'egalitarian' societies that you crow about were anything but the nice peaceful folks you want to believe in.  How many of the indian tribes made slaves of people from other tribes?