“I could tell you 100 stories and it wouldn’t cover what the people I’ve met have to say,” Sindy writes to me, shortly before 1 a.m. her time. She has spent the past year in Kurdistan, where she works with individuals who have escaped the horrors of ISIS.

Horrifying reports continue to pile up about the ways in which the Islamic State is using the rape and sexual slavery of Yazidi women as a tool of war. A new report in the New York Times makes it clear that it’s also become an attractive recruiting tool, a draw for men from conservative Muslim societies where casual…