Well... my mom's a vegetarian. Has been since the late-1960s[when I was just a wee bairnie]. She's not very dogmatic about it -- she eats fish -- but I think she just doesn't want to eat animals. Mom grew up on a dairy farm and counted the cows among her pets [and the geese, but that's another story].
I've often wondered what would happen to the herds of Hereford and Angus if the world went vegetarian. I mean, what would be the point of maintaining breeds of cattle -- not to mention pigs -- that only exist, and were developed solely for the purpose of providing meat? It's not like Angus and domestic pigs could live in the wild...
Maybe we could slaughter them all and have one really big barbecue.