I suppose its possible that you're just aware of more nuance in food-related things and that an average consumer like me would call those documentaries okay too.
But I think I'm as ignorant about agricultural issues as I am about athletics, it's just that if you look at, say, What the Health[0] or Cowspiracy[1] you immediately get a feeling the crew started with a thesis and then looked for reasons to sustain it, but didn't bother at all with different views.