Apparently it wasn't a BIG part of the story.
The film is composed of striking contrasts. Wide vistas of desert passing through canyons that look like ruined cities, down to grains of sand and the ants and maggots that devour all dead things. Despite it's loveliness and themes of purity it is a lizard-eat-lizard world, red in tooth and claw. Much hunting and killing and butchering, none of it faked.
Into my heart an air that kills
From yon far country blows:
What are those blue remembered hills,
What spires, what farms are those?
That is the land of lost content,
I see it shining plain,
The happy highways where I went
And cannot come again.