动物也吃动物，为什么我们不能？

This argument commits the “appeal to nature” fallacy. Wild animals also kill their young, engage in forced mating, and have no concept of property rights — yet we do not use these behaviors to justify the same in human society.

Humans are moral agents: we have the ability to reflect on our actions, understand consequences, and make ethical choices. The fact that a lion eats a zebra does not give us moral permission to breed, confine, and slaughter billions of animals in factory farms.