Whether you love or hate the United Nations, one thing all Americans ought to be able to agree on is that sloshing billions of American tax dollars into the UN, with little accountability and regardless of UN performance, is a chump’s game. I’d even suggest it is no favor at all to the UN itself — corroding its incentives for decent behavior, and swaddling its staff and offices in plush sinecures that are increasingly catching the attention of financially strapped American taxpayers, who pick up the biggest share of the UN tab. Yet the chief effort currently on the table...