I argue that opinion is not fact and cannot be treated as such because that opinion is relative to the person that has it. Example: It is not a fact that rape is wrong. This is because the concept of right and wrong is an opinion and cannot be used to make judgments about the action. We may deplore the action as wrong but we should understand that that is our opinion and is only relative to us. That should be a fact. Assuming otherwise would be like assuming a Borg-like collective intelligence among humans that allow us to all feel the exact same way about the exact same thing.
There was something else I was gonna write to explore my understanding of your perspective but it was lost in the Quick Reply box... if I remember it I'll post it.