I also believe that people who eat a vegan or vegetarian diet out of ethical concerns should expand their view of ethics to include all the animals who are killed or whose habitats are destroyed by large scale agriculture. We all live on this planet earth and are complicit in the destruction of our habitat (there are many human practices that either presently or ultimately harm humans or both) and the habitat of the many other creatures who inhabit this planet. Ethical concern for all living beings must include all our practices. There is not any way we can't leave some foot print but we can be mindful of the foot print we leave. I eat meat but I am mindful of the practices used to raise and slaughter the animals I eat. I have multiple food sensitivities and can't eat legumes. Getting sufficient protein on a plant based diet would be impossible for me yet I see the way I eat as ethical in light of my circumstances. A tunnel vision view of ethics that included simply avoiding meat (especially if it also includes disparaging people who eat meat and engaging in other harmful practices) reflects a very limited view of ethics. By thinking carefully of how we each live our lives, we can each determine how to live ethically that is suitable for our circumstances and also take in the needs of other beings on this planet.