There are other reasons to be veggie. I am nearly veggie but my reason is I don't like eating animals. But I am an animal person and not ignorant about the farming business. One who likes to make meals from scratch using natural ingredients, including meat for OH, produced by British farmers by choice, (or myself!) and avoiding anything with "vegetable fat" or palm oil, wherever possible.
For many years I earned my living from hunting farmers. Don't agree with hunting either....for me (and yes, I have been and understand why people do it, it was an amazing experience, but no fox killed on this occasion) So it would be rather silly to not eat meat for the reasons given in previous posts. Just because it is not for me doesn't mean I think it's wrong.
I'm not precious about cheese, though given a choice I would rather eat veggie. Genuine Parmesan is always made with animal rennet. And my dreadful feet need leather shoes, and my horse needs leather tack (alternatives are not all they could be.) I have had most of it for thirty years, well looked after.
So I describe myself as a nearly veggie.