I don't think a novel's main donation, main gift, is the document. The document is there, but a novel goes beyond documentation. It goes into opening a new vista, opening a new perspective, showing familiar things in an unfamiliar way, and making the reader reconsider the documentary facts which he or she may have known before.
The best thing about being an artist, instead of a madman or someone who writes letters to the editor, is that you get to engage in satisfying work. Even if you never publish a word, you have something important to pour yourself into.