BAGHDAD — When Wathiq Htaib talks about the crisis in Iraq, he does not mean politics or sectarian strife. On a recent afternoon, Mr. Htaib, 31, sat on the floor of a small, bare room where six family members sleep each night. “Every day we have a crisis called the ‘morning bathroom crisis,’ ” Mr. Htaib said, to affirmation and laughter from several of the 13 family members with whom he shares a small house and one very stressed bathroom. “Sometimes we’re late for work because we have to wait an hour for the bathroom.” Beneath the grand issues hanging over Iraq, like the coming national elections or the continuing violence, the day-to-day...