I'm a vegetarian because I was raised a vegetarian and I was allowed to make a decision whether I wanted to eat meat or not and I declined. Why? Because no animal should be born to be slaughtered. I disagree with intensive farming because it's immoral. Animals have a nervous system, so they can feel pain and emotions. Some people say animals have no morals, but I've seen a mother cow fight to the death to save her calf being taken away from her.
Okay, yeah, we have canines. Yes, these animals are going to die anyway. But we can make a moral decision to save animals pain. Saying this, I have no issue with people who hunt to survive because that's what the human race was born to do. But intensive farming? Mass breeding animals that will never see the sky? Pumping them full of unnecessary antibiotics? Not ethical. Not right.
Being a vegetarian is also healthier. We reduce global warming and our carbon footprint by something like 56% than those who eat meat.
I don't have a problem with other people eating meat, of course. I just wish people were more aware of the pain and global impacts of eating meat, is all.