I initially became a vegetarian for this reason: I have a great hatred for the treatment of animals in what we call factory farms. That, I felt, was one of the most horrible and bestial things, and I was constantly protesting about it. Then, when I protested, somebody would say to me, "Do you eat meat?" And if I said, "yes," then they would say, "Well, how do you know that that isn't made in this way?" And I realized that if I were to remain a meat-eater that I couldn't go on protesting. So that was the actual impulse. But since then I've come to feel that it does purify one, and I would find it very abhorrent to go back to eating meat. I've found that it has got a spiritual significance, but my initial motive was that—to be able to give a valid answer to that. … [Have you ever visited the factory farms?] Well, I have seen them. I've seen the chicken ones, which are quite horrifying. And I have put my head in others. But the whole thing nauseates me more than I can tell you. To see meat produced in that way made it impossible for me to eat meat.
Malcolm Muggeridge, interview in The Vegetarians by Rynn Berry (Brookline, MA: Autumn Press, 1979), ch. "Malcolm Muggeridge".