No, you can not assume that movies aimed at a mass audience are documentaries. Theatrical movies are meant to entertain a high number of people in a set amount

No, you can not assume that movies aimed at a mass audience are documentaries. Theatrical movies are meant to entertain a high number of people in a set amount of time. So, it's no surprise that they are inaccurate. Made-up drama and character mashups are going to beat facts. If people want factual accuracy then you should stick to documentaries and history books. Theatrical movies will always be inaccurate and that's ok. I watch movies to be entertained.