Sitting in an intro philosophy class my sophomore year at Union University, I was asked a question: Would it be ethical to sacrifice a person (or a few people) in order to find the cure for cancer? Well, yes, of course it would, I said. We’re talking about cancer, right? I was nineteen and, apparently, omniscient—or so I thought at the time. The certainty of an arrogant college student is a certainty like no other.