If you think pigs, chickens and cows have the same level of awareness and perception as broccoli, tomatoes or potatoes than you're the potato.

Humans have to eat and with the exception of a few minerals like salt, everything edible to humans is alive on some level. Vegansisn is making an ethical choice about reducing what causes the most pain fear and suffering in another. If I were to develop cancer, a tape worm or a virus should I also allow those living things to thrive as well or does "Uh, now what?" also apply to antibiotics?