‘Deep at the heart of the horror of what’s going on lies the caste system: this layered, horizontally divided society with no vertical bolts, no glue, no intermarriage, no social mingling; no human—humane—interaction that holds the layers together. So when the bottom half of society simply shears off and falls away, it happens silently. It doesn’t create the torsion, the upheaval, the blowout, the sheer structural damage that it might, had there been the equivalent of vertical bolts.’