Outraged human-rights activists rightly say “never again” as they urge action to stop the genocide in the Darfur region of Sudan. But the world is perfectly content with “again.” It is heartening to see left-wing celebrities like George Clooney, who headlined a Darfur protest in Washington, D.C., over the weekend, publicize the cause. But it would be even better if they realized that, in this context, multilateralism kills.On Darfur, the “international community” offers only bad faith, selfish business deals, absurd political pandering, and moral obtuseness. With any truly nettlesome international issue, it is almost always thus, which is why the...