Joe Biden’s much-touted trip to the Middle East—his first as president—produced no significant deliverables. To be underwhelmed, however, is to miss a more troubling story. The visit may have been pointless and performative, but it was also a major setback for American interests, confirming what many long suspected: Supposed allies can disrespect, embarrass, and undermine the United States at will. The costs are already evident. On Saturday, less than 24 hours after Biden left the region, the United Arab Emirates sentenced an American citizen, Asim Ghafoor, to three years in prison on nebulous charges. Ghafoor, a lawyer for the slain...