Whether it was the original plan or not, by the time the movie gets to the end credits the parallels to a lynching are incredibly explicit.

I'd like to put in a rec for https://www.imdb.com/title/tt0053454/ "The World, the Flesh and the Devil", which is an apocalypse movie with a slightly different premise: what if the only survivors of an apocalypse in apartheit 1950s America were a black man and a white woman? Contains some great shots of deserted New York and some very intense performances.