This isn't animal experimentation, where you an imagine some proportionate good at the other end of the suffering. This is what we feel like eating. Tell me something: Why is taste, the crudest of our sense, exempted from the ethical rules that govern our other sense? If you stop and think about it, it's crazy. Why doesn't a horny person has as strong a claim to raping an animal as a hungry one does to killing and eating it?