There are people who are suffering beyond description. They are innocent people, they didn't bring this upon themselves. They are the victims of the sins of other people. And while it's hard to see, it's important to understand that these people exist.
I'd studied 16th century science and magic. I thought it was strange that people were interested in the same kinds of things my research was about. The more I thought about it, the more intriguing it became and pretty soon I was writing a novel about a reluctant witch and a 1500-year-old vampire.