We send one species to the butcher and give our love and kindness to another apparently for no reason other than because it's the way things are. Whe… - Melanie Joy

What I've found is that, because most people are deeply disturbed by and feel guilty about eating meat, and yet at the same time fear not eating it, they defend themselves from having to acknowledge such conflicting feelings. These psychological defenses include denial (“Animals don't really suffer when they're raised and killed for meat.”); justification (“Animals are meant to be eaten by humans.”); dichotomization (“I'd never eat a dog, but I love bacon.”); avoidance (“Don't tell me that; you'll ruin my meal.”); and, most importantly, dissociation (“If I think about the animal when I'm eating meat I feel disgusted.”). … When people break through their dissociation, the feelings that typically emerge are empathy—and therefore disgust. That's why people tend to be disgusted by the idea of eating “unusual” animals, such as dogs and gorillas; they haven't learned to dissociate from these kinds of meat. It's also why vegetarians usually find all meats disgusting.

The carnistic schema, which twists information so that nonsense seems to make perfect sense, also explains why we fail to see the absurdities of the system. Consider, for instance, advertising campaigns in which a pig dances joyfully over the fire pit where he or she is to be barbecued, or chickens wear aprons while beseeching the viewer to eat them. And consider the Veterinarian's Oath of the American Veterinary Medical Association, “I solemnly swear to use my … skills for the … relief of animal suffering,” in light of the fact that the vast majority of veterinarians eat animals simply because they like the way meat tastes. Or think about how people won't replace their hamburgers with veggie burgers, even if the flavor is identical, because they claim that, if they try hard enough, they can detect a subtle difference in texture. Only when we deconstruct the carnistic schema can we see the absurdity of placing our preference for a flawless re-creation of a textural norm over the lives and deaths of billions of others.

We love dogs and eat cows not because dogs and cows are fundamentally different—cows, like dogs, have feelings, preferences, and consciousness—but because our perception of them is different.