I've mentioned historic and current moral failings of various nations and religions here.  Let it be clear that I'm not picking on anybody.  It's a hard world and everybody fights dirty.  I'm proposing that we improve on that.  For example, I disparage the Indian removal of the 1830s, but that doesn't mean America is particularly evil, or the victims of that particular evil where angelic.  Those same indians were very territorial slave holders and probably had numerous other flaws.  When you paint a picture of devils and angels you always do so by leaving things out.  We can condemn practices and cite examples of them without drawing further general conclusions.  History is for teaching lessons, not for adding up scorecards.  History is full of ethnic cleansing and apartheid and caste systems.  This universal trait of "nations" comes from the fact that the people on top of a society are the hardest fighters, while the people lower down can generally be sweet.  

Should we try to make everyone sweet?  I think that would make us weak.  But I don't extol evil either.  I think everyone should develop and maintain the capacity for a full range of behaviors and then choose to prefer goodness in practice.  Societies should be structured to maintain a high rate of vertical turnover, and it should be based on those characteristics I just extolled:  ability to do whatever, preference to do right.