No government can be held responsible for a standard of behavior that was developed after it was in power. For example, a regime that tolerated slavery when slavery was the norm should not be expected to have abolished slavery at that time. If one does so, it is to that government's credit. Likewise, wrongs that are committed against people in one time can no longer be rectified after either the perpetrators or the victims have passed from the scene. Reparations can only be paid by the actual perpetrators to the actual victims.
People are different, having different abilities, talents and interests.
Groups, being made up of people, also have different abilities, talents and interests, no matter what you use as a criterion for distinguishing between groups. Some things are objectively better than others. When making a knife, steel is objectively better than water. Likewise, some cultures are objectively better at some things than others. To say otherwise is to imply that people who have given up traditional methods in favor of new ways of doing things because they thought they were more effective are deluding themselves.