Lord krishna never did support mistreatment or oppression of the sudras...He ,being the full and perfect incarnation of God,in fact,opened ignorant people's eyes to the truth that all caste systems,namely-brahmins,kshathriyas,vaisyas,sudras,are equal in the eyes of God.the difference being that these people belonging to various caste systems had different duties to perform in this world,according to their inborn nature,which depended on the kind of actions in previous births,which only God knows about. people are and always been ignorant through the ages,they cannot understand or even make an effort to see the real divine meaning which is hidden in the sacred scriptures.I feel,that if any mention is given on the basis of skin colour,it could mean people of demonic qualities,not virtuous people.God sees all,he knows all,His law of karma runs the universe.we reap what we sow.no one is a brahmin by birth,it is only when we try to reach the state of brahman,that we can be called brahmins.and which ever caste system we belong to,we cant escape from our karma!
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