One very pragmatic reason is that the promotion of a harmonious and cohesive society is in a country's economic and political interest so as to prevent costly social disruptions stemming from poverty or social exclusion.
一个十分务实的理由是，促进和谐团结的社会符合国家的经济和社会利益，可以防止贫穷或社会排斥引发代价很大社会动乱。