Why are you a vegetarian (or not a vegetarian)?

I’ve heard a lot of arguments, some better than others, for vegetarianism or against it. I’m a vegetarian because I don’t think that it’s necessary for people in developed countries to eat meat; doing so just increases our species cruelty toward other species and I believe, as the dominant species, we should try to limit, if not completely stamp out, this kind of cruelty. What do you think?