Short quote: foie gras
The War Against Dietary Self-Determinism:
But sustainability does not change a fundamental fact: that the food system almost all of us are a part of not only tolerates violence – and yes, sometimes even cruelty and death – it anticipates and embraces it. Though one can appreciate the argument that a vegetarian diet imposes a smaller footprint on the world, the responsibility for this relationship rests not solely with carnivores, but with all of us who feed at the trough. Even the farming of grains and vegetables is undeniably responsible for the loss of animal life: farms displace natural habitats, farm equipment unavoidably intersects with wildlife, and even organic fertilizers may contain animal products (blood, bone meal). Food morality is not as black and white as we like to believe: it's possible to raise animals sustainably and it's possible to raise vegetables unsustainably. Neither side has a monopoly.
After reading this letter, this seems like a good place to put Mike Rowe's discussion of lamb castration, PETA, and American labor: