Throughout my experience as an editor, I’ve found that nonfiction writers are more inclined to go off topic than fiction writers. I believe passion plays a huge role in writers’ rabbit holes, tangents, and off-topic stories or anecdotes. When writers are angry, allow their personal biases to seep through their work, or let their passions run wild on paper, that is when I see writers jump the tracks from the purpose of their book and digress into uncharted territory. Over the years, I’ve heard writers defend their side topics. “But it adds color to my writing,” they will say, or…