One of the fundamental misconception related to the caste system is that people are born into their respective caste. Genetic inheritance may play a small role in the guna and karma aspects of an individual, however, their true guna and karma is what is relevant to decide who a person really is. Someone born to a traditionally Sudra family, may be a great thinker and have other satwick qualities. In the eyes of the Lord he is a Brahmana. Mahatma Gandhi championing the cause of the untouchables is borne out of a deep understanding of this fundamental principle.