That's not realistic. It's what do the facts say that is difficult. e.g. was Julius Caesar a great general and statesman or a cruel tyrant? Or both?
Historians have come down on both sides. And a few saying "somewhere in between".
Everyone "manipulates" the past to one extent or another, either to justify or to condemn someone or something in he present. In fact, I would go so far as to say that any given "take" on the past tells you as much about the historian as it does the history.