The Touchables, whether they are vegetarians or flesh-eaters, are united in their objection to eat cow's flesh. As against them stand the Untouchables, who eat cow's flesh without compunction and as a matter of course and habit.

The reason why Broken Men only became Untouchables was because in addition to being Buddhists, they retained their habit of beef-eating, which gave additional ground for offence to the Brahmins to carry their new-found love and reverence to the cow to its logical conclusion.

Generally speaking, the Smritikars never care to explain the why and the how of their dogmas.

B. R. Ambedkar Quotes