If we start to get picky with the things we eat, because they can feel pain, then we really have to take it all the way. Plants feel stress, kindness, and even pain. That not only makes Vegetarians murderers, it’s almost a Genocide. The multi-vores, at least, don’t follow moral guidelines with food and eat what their organism tells them to.
If Fur is murder, and Meat is Murder, and Technology is Murder, then you can count on Vegetarianism being Murder as well.
This is for all you philosophical carnivores out there. Have a Heart, eat a Rock.