Humans and many other great apes are opportunistic carnivores. The idea that we should have moral compunctions about biological reality seems absurd to me, and I have yet heard any argument than "suffering is evil; animals experience suffering; killing animals necessitates their suffering; therefore eating animals is evil." I don't deny the second proposition, I deny the first, and my personal feeling is the reason some of us now feel differently has much to do with the enormously sheltered and privileged lives modernity has afforded us.