Imagine that it is the moderately distant future and you are a historian. Some highly specific catastrophe has wiped out historical records except for films (let’s say a cautious film buff built a very secure archive on the moon). Your task is to reconstruct the history of the Second World War, but the only tool you have available is war movies.
You would actually be able to get quite a lot, I should think: for instance, you’d be reasonably easily able to work out the dates, the places and the major combatants. You would be able to identify characters who almost certainly existed (Churchill, FDR, Hitler, various generals, various celebrated heroes, villains or victims). You could probably reconstruct a lot of the uniforms, equipment and technology, even some of the slang and language. You would know that there was a lot of fiction in your sources, but there would also be a lot that even the fantastical sources would agree on.
You would probably get a very exaggerated idea of the role of the US and Britain relative to the USSR, but you’d be a smart, critical person and you would think to yourself that this might be because of the much larger English-language film industry. You would know a lot less about the war in
When it came to specific incidents, though, it would be a lot harder. There are plenty of major battles that have several films about them, so it wouldn’t be hard to pin those down, but I suspect that there are a lot of quite real people and incidents which appear in only one film. You’d be unsure about those: you would know that “based on a true story” was a literary trope (with only a film archive surviving of Earth’s culture, you’d be something of a film-studies expert, after all) and not automatically credit it. So there would be a huge range of stories where you just wouldn’t be able to tell whether they were real or false.
You’d wind up arguing about historical events largely as works of art: so, for instance, Kelly’s Heroes has all the tropes of a comedy film, and comedy films are typically not historically accurate, so that one is probably unlikely. But there would be debate about it in each case. And there would be a huge number of events which were important but which, because they were simply never made into a movie, were completely lost to your knowledge — people whose actions influenced history greatly but who no one of your era would ever hear of.
You would be very conscious that you were studying, not a thing, but the stories told about that thing, and understanding those stories would be a challenging task in itself, requiring its own specific expertise.
This is — a little bit — what it’s like being a historian in most periods.
Now, I’m not saying that Movie Monday is anything more than just an excuse for me to mock things for the kinds of stories they tell about history. I just thought it was a fun analogy.