As Ambedkar wrote, it is brahmanical patriarchy that keeps the caste system intact. Today, with women becoming educated and choosing their own husbands, patriarchy is being challenged, caste divisions are being crossed and, unfortunately, honour killings are on the rise. But if India wants to put the caste system behind it, the government needs to do it all it can protect the inter-caste couples and be firmly on their side, writes Lokesh Kumar