It has high realism precisely because not everyone believes in a dog eat dog world. There are those that sacrifice themselves to save someone else. The immigrant that believes he is inferior simply because he came to the land and you have genuine human elements come to the surface even in the brutal world.
It doesn't lose a second on pointless discussions. It just starts strong and goes on and on until the very end. Substance all the way through. It's not just gore for the sake of gore or for shock value.