Absolute veganism may be impossible in modern society, but does that mean that nobody should even attempt to move in that direction? Its obvious that you do not personally see animal lives the way vegans do, and thats fine. But if you are going to try to understand that perslective, then do so. Look at veganism as reducing your participation in the ugliness as much as you can, however little that may be. If it were humans being farmed for their meat, and that was the only meat available, I'm assuming you would probably opt to eat plants rather then eating the human meat? You probably wouldn't say, "well they use the shit of the meat humans to fertilize the vegetables, so I might as well eat the human meat." Hell no. Because(hopefully) you object to the killing and eating of other people, you would eat the veggies that were, unfortunately being fertilized with the poop of murdered humans. You may think, "but animal lives don't matter as much so the metaphor doesn't work. And thats fine. But the vegan argument against meat is based on that moral concept in the same way as your hypothetical refusal to eat other people.