Caste fragmentation leaves each Hindu isolated and therefore cowardly in conflict.

Evidence

The Hindu can derive no such strength. He cannot feel assured that his fellows will come to his help. Being one and fated to be alone, he remains powerless, develops timidity and cowardice, and in a fight surrenders or runs away. The Sikh as well as the Muslim stands fearless and gives battle, because he knows that though one he will not be alone. The presence of this belief in the one helps him to hold out, and the absence of it in the other makes him to give way. — Ambedkar, B R, Annihilation of Caste_ The Annotated…, 894