Here's an interesting link: http://www.dailymail.co.uk/news/arti...ok-claims.html
In "Spectre Of The Gun" we see a portrayal of Wyatt Earp (and his brothers) that runs rather counter to how he was/is usually portrayed in film and television. Usually Wyatt is portrayed as a rather righteous and sometimes reluctant lawman. But in "Spectre Of The Gun" he was portrayed more as a sinister would-be killer. He certainly wasn't portrayed sympathetically.
Is it just possible that TOS could be about the only time Wyatt was portrayed at least remotely more like the real person? I'm not saying the writers were out to deliberately correct history, but that just maybe their approach to the character just coincidentally leaned a bit closer to what the real man might have been like.