I'm a vegetarian - I think there's a strong possibility, had I not become a vegetarian, I would not be working now. I became a vegetarian about 25 years ago, and I did it out of concern for animals. But I immediately began having more energy and feeling better.
I know lots and lots and lots of vegetarians who think it's perfectly all right to kill animals for food to eat, but don't do it because they think all the ways in which it's done are wrong.