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If cows and pigs have no business living on this earth except for our consumption, then what business does any animal that isn't eaten have? What separates a pig from any other animal? Why don't we just go ahead and wipe out elephants, tigers, bears, wolves, and pretty much everything else?
Not that I'm especially bothered one way or the other. Provided they live a good life, and aren't put through battery farm-esque conditions, I don't feel too bad. I still don't like the thought of animals being slaughtered for food, but I can accept that it's part of the way that the world works, and that there's a big difference between killing an animal for sustenance and killing it for something incredibly trivial like ivory, or simply a head to be mounted on your wall. Still, I think it's pretty silly to argue that we give pigs and cows a place in this world simply because they happen to be bred for food. They exist in just the same sense as any other species...
Oh, and for the record, there's tons of wild cows in the highlands of Scotland.

You see them pretty often up there...