The reason why some fiction writers do a ton of research and then get historical stuff wrong is because they have done a bunch of work, but not done the thinking that will carry them that one step further into understanding. When writers (writing fiction, history, or, in fact, anything) take that extra effort to understand, it shows in their work. In other words, facts are seldom enough, especially for fiction.
I do hope that stating the bleeding obvious is not going to be my total day, but so far it rather looks like it may be. Welcome to PhDland.