Anu Ramdas, who writes from a Dalit perspective, offers some food for thought on her blog, Time and Us.

i recently read an academic paper which was laboring to make a point about UN recognizing caste as a race issue and trying to decipher the relation and difference between race and caste. this is what this picture made me write “caste is not a sibling of race, it is not even the parent, it is the God of all forms of discriminations.”  just look at those women’s faces, there is no hate, there is only a supreme conviction of righteousness, such pure dharmic expressions. who needs conical masks and nooses, who needs to disguise hate that is so pure that it does not even require the face to contort into a negative expression.

More here.