People will be more likely to believe something that is a true story instead of something that's made up. They might be all into the fictional movie, but in the end they'll still say that it's not real so it's not as impacting. If it's something real, odds are they will be more affected by it and start to face obstacles themselves.
When I watch movies, even if they say based on a true story, I find it difficult to believe most of it because I knows how in the movie business they embellish small details to make a great story. It's difficult to believe movies, but it's pretty easy to believe documentaries because they are in fact real.
