History or for that matter even present is mostly grey, hardly black and white.
More often than not, right and wrong is only a point of view.
It’s our environment(upbringing, religion, education, society, culture, relationships), everyday experiences, and the information that we gather from books and media, people around...(DNA & lots of other complicated stuff?!) that forms our world view.
Nothing wrong in being opinionated though.
My point of view:-)