Vaccinating the whole world is the reasonable thing to do — not just the right one. Britain’s example shows in vivid detail what will happen even to rich countries now, much faster than they imagine: new vaccine-resistant variants will hit them, which come from unvaccinated poor countries. After the Indian variant, there’s the Vietnamese one, and on and on. Vaccinating the world is something we did before, too. We successfully eliminated smallpox and polio. But we didn’t with Covid. And that is a major, major, profound, colossal step backwards for humankind. It is the kind of epic, disastrous megafailure that says: we are entering a new Dark Age, where the light of reason is winking out.