I saw a fairly well done horror documentary called SAVAGELAND involving the mystery behind a massacre in an Arizona border town called Sangre De Cristo (Blood Of Christ) and the one survivor, an undocumented Mexican immigrant, who is tried for the mass murder despite the evidence and sheer unrealistic assertion that he could have killed over 27 people in one night.
It is professionally done for a low budget, but, at the same time, you figure out what "really" happened early on, but the film never just comes out and says it even at the point where the audience obviously knows what sort of horror movie it is. Also, as far as the case it makes for prejudice against Latinos, it also works against that theme with the central conceit of its narrative.
However, it focuses on the human aftermath of the story pretty well so you ignore the few obvious inconsistencies with the story.
There are a few movies called Savage Land in the horror field, so I actually thought it was a different one when I started watching.