To remain stuck to a belief that renders one to a lower caste (what ever that means) is better than accepting a Deen that has no such divisions defining human existence? The Qur'an says it has graced Humans with dignity. Only our deeds make us good or bad.
Does not the video makes one vomit with repulsion over rolling over eaten left overs of "upper caste" Brahmins?
If I were a Dalit, I would have chosen to get out of that belief system and accepted Islam (even with sects). It would have enabled me to further study it and then move out of sectarianism.