Bigotry is an odd thing. To be bigoted you have to be absolutely sure you are right and nothing makes that surety and righteousness like continence. Continence is the foe of heresy.
All good books are alike in that they are truer than if they had really happened and after you are finished reading one you will feel that all that happened to you and afterwards it all belongs to you: the good and the bad, the ecstasy, the remorse and sorrow, the people and the places and how the weather was. If you can get so that you can give that to people, then you are a writer.
For a true writer each book should be a new beginning where he tries again for something that is beyond attainment. He should always try for something that has never been done or that others have tried and failed. Then sometimes, with great luck, he will succeed.
If the reader prefers, this book may be regarded as fiction. But there is always the chance that such a book of fiction may throw some light on what has been written as fact.