While there are certainly opinions which are more learned than others, based on a collection of random factual information, it is still an opinion that is based primarily upon how those facts are pieced together to establish the researchers primary biaes. In other words all History is, is the Opinions of the researcher.
The old addage "the Victor writes the history" is a trueism. How do we know that the common interpretation of our history is the correct Interpretation?
Or is there somethings still out there that we have missed or has been purposely hidden from the records to justify that "common intrepretation"?
The fact is we still do not have all the "facts".
It has been estimated by the National Parks Service that since April of 1865 there has been on average one publication written about some incident that occurred during that four years for every day that had been lived since that date. In other words one book, or article, or publication per day for 365 days each year, times 150 years at present. Even the reports contained in the "offical Records" were written well after the incidents occurred and after a period of time for reflection of in most cases several Months. How do you arrive at a "single expert opinion" from that much printed material, let alone all the Records, Diaries, Letters, Newspapers and boxes of papers in the National Archives which have not as yet even been catologed let alone looked at and studied? That comes from no less a scholar that Mr Bill Shay who has looked at some of those very documents and papers still setting in the archives.
My point here about there not possibly being such a thing as an "Expert (all correct) Opinion", is that it is physically impossible for a single person to assimulate that amount of information and being humanly able to determine what information is important and what is not. So therefore we generalize, (following our personnal biases), what little information our poor brains can understand.
When the pool of factual Information, from which our conclusions are formed, is not pure, even to the our sacred "Official Records", Can our Conclusions be absolute?