What's The Purpose?

I think Pollan's purpose for introducing us to Steer 534 was to show us an inside look on what goes on in the place that they force the cows to eat corn instead of grass so we would think something along the lines of, "Wow, that's just wrong. Someone should do something about this." Or something like that. I think he introduced us to this cow also so we would feel something for it instead of explaining what goes on in general, he goes deeper and paints a picture of the life of one cow.