In the autumn of 2013 I was in my first term of school in a decade. I had two jobs; my husband, Tom, was working full-time; and we were raising our two small girls. It was the first time in years that we felt like maybe things were looking like they’d be OK for a while. After a gruelling shift at work, I was unwinding online when I saw a question from someone on a forum I frequented: Why do poor people do things that seem so self-destructive? I thought I could at least explain what I’d seen and how...