Minorities in Iraq are making progress. Most of the Yazidi refugees trapped on Mount Sinjar by Islamic State fighters have escaped, thanks to U.S. airstrikes, which means a rescue operation may not be necessary. A U.S. military scouting mission found that far fewer people are stranded than initially thought, and they are well-provisioned. Attention now turns to whether Iraq’s Shiite-led government will learn to coexist with the minority Sunni population. Its incentive for doing so? Continued U.S. support against Islamist militants.