Whether we tell our tales fictionally or not is not the important factor. That we tell our tales true, from the heart, and give every word the utmost attention IS what's important. All great words are art, and like all great works of art, they will be interpreted over time. They need not be true or false. It is the mystery behind their origination that makes them unique or special. Everyone always asks a writer, "where do you get your ideas?" Sometimes those ideas come from a real, dark place in the writer's world. We put them into words so we can touch them, feel them, and so that we can confront them.
Think of the impact of Orson Welles over the airwaves as he recited the words from "War of the Worlds." Think of how much the words, the way they were spoken, the way they were structured, made people BELIEVE they were real. It mattered little that it wasn't real. The listeners FELT something.
We need not explain, as writers, what we write or why we write it. We need not outrightly admit to the truths or the fictions in the words we write. We need only capture the minds and the imaginations, and the EMOTIONS of our readers, and let the words take them where they may.
Edgar Alan Poe was a master. In reality he was a very troubled man. His words are meant to be written as a way for the writer himself to deal with and confront his personal demons. We as readers simply get to take that journey with him. He makes it fictional. Somehow I think he was speaking about himself more often than creating situations for characters to suffer.
I don't care whether the tale you tell is real or not, so long as I walk away with a deep and profound sense of whoever it is, the character telling the story has been able to effectively make me feel and understand the pain that is there.