Wow. So every event in history that occurred in which I was not present is simply my "opinion" no matter how well documented? There are no words. Maybe the single dumbest post in the history of this forum or perhaps the entire Internet. Astounding.
You can not be so stupid, can you? That's not what I said. Your strawman is - as per usual - bogus.
So every event in history that occurred in which I was not present is simply my "opinion" no matter how well documented? No, not "no matter how well documented". To accept something as a historical fact, by a person who was not there to witness it, depends exactly on how well it is documented.
World War II is extremenly well documented to the extent that it clearly is a historical fact and future generations will still see it that way. It's one of those events that can not be denied, regardless of anybody's opinion.
The disappearance of the two Princes in the Tower of London in 1483 is, more often than not, attributed to their uncle who, it is claimed, had them killed so he could become King Richard III. Although the disappearance of the boys is well documented and can be regarded to be a historical fact, their alleged murder at the behest of their uncle is not. That's only an opinion for which there is very little to no evidence.
The donation of Constantine is allegedly a 4th century document that was believed to be authentic for nearly a thousand years, until it was exposed as a 8th century forgery in the late 1500's. There never was any evidence for it's authenticity except for the document itself. All the people who believed it to be authentic had the wrong opinion.
The murder of JFK, on 11/22/63, is beyond dispute. The evidence for the event is overwhelming. However, the opinion of a historian about JFK, published in a newspaper, is no way near as well documented and can not be regarded as a historical fact. If you choose to believe him then that belief becomes your opinion.
I hope you get it now, because I can't dumb it down for you any further.