History is a bitch in the hands of the current political arrangement. There are indisputable historical facts about things in the past that have happened - wars, civil conflicts, inventions, works of art. Then there are endless possible interpretations and viable (but not provable) causal relations between the facts. Heck, we can't even identify the proper causal relationship for events happening around us right now. Then how about going N centuries back and trying to reason about the involved parties and their intents? We don't know what conversations took place between them, what their internal agenda was, etc.