I was a vegetarian for about a year and a half, and that was because I thought we shouldn't eat meat. I didn't like the thought of animals being born just to be killed. It didn't seem fair.
I guess I still kind of think that, but I eat meat now - I just don't think about where that meat is coming from.
There are lots and lots of different options that could be made instead of meat, but whilst so many people choose meat, it woun't stop.