When examining history, both good and bad, it's often difficult to tease out the precise details you want to share. What do you leave in? What do you take out? What details and minutiae do you list in depth, and what do you gloss over because you don't think they're important, or you're concerned about derailing the story you want to tell?
And that's only considering the facts, and not any sort of spin you want to put on them when you're telling the story you want to tell.