Why do vegetarians, vegans, etc. propose a different set of rules for animals?

Why do vegetarians, vegans, etc. propose a different set of rules for animals?

Why do vegetarians, vegans, etc. propose a different set of rules for animals? After all, humans are animals too. Why can a lion kill and eat an antelope wheras a human cannot? Why does it matter that we do not 'need too'?

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