I find Peter Singer's argument that animals' (specifically mammals') capacity to

I find Peter Singer's argument that animals' (specifically mammals') capacity to feel pain which according to him makes them intrinsically worthy of special status rather faceious as evolution is scientifically proven to not be teleological. If I uproot a cabbage (in the process killing microbes and insects) and eat it, how am I any more immoral than if I kill a cow or a dog and eat it? Why is an organism's place on the phylogenetic tree so special?

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