I see what you are saying, and yes, those scenes were in there for the audience. But I don't think that's a bad thing in this case, because it gave a visible, tangible form to what was happening in those camps. For a lot of people, there is a sense of distance when you learn about it in school or read books about it. Seeing scenes like those can, for a lot of people, be more impactful because seeing it happen in the moment feels realer than reading or learning about it.