Anu explains that silence doesn’t mean the absence of resistance:

This on the face of it seems like pretty sound explanation, so with a magic wand if we push the upper caste down the ladder, upper caste men lose their ‘manhood’ when their women are appropriated and humiliated, right? Any caste that finds itself at the bottom of things, will experience it, any human aggregation that finds itself stripped of its protection from civil society; such as during war and unrest, experiences this.

Substitute caste in that paragraph with war, and nothing changes.

The uniqueness of caste being that the forces keeps it in a war like exploitative situation. It must be the longest war in the history of mankind, and with that -the longest history of resistance. Dalits did not die out, that is the proof of their resistance and also proof of the pace at which the aggression keeps evolving.