As a pescetarian, I just want to say you have to draw a line somewhere. We are closer to pigs than pigs are to fish. You have to eat some other form of living organism, which means killing it, (ignoring fruitarians here, sorry guys!) to live yourself. I'm guessing most people here don't eat humans? Everyone has a line they don't cross. I could just as easily find a cross section diagram of a human and believe me, you find more similarities there with the human and the rabbit/thing, then with that rabbit/thing and the fish
From an environmental point of view as well, cattle is a horrendous use of land. If it were used for crops instead, there would be far less problems with starvation in the world. What else do you propose we use the sea for?
Please do not call me confused. As somebody who has made the dedicated decision to avoid most forms of meat, I have thought about this a lot.
EDIT: Just to say, I do call myself a pescetarian, but most people don't know what that means. I then clarify "a vegetarian that eats fish" rather than "a meat eater than doesn't eat chicken, beef, lamb, pork, quail, duck...." because it's a lot easier. Not confusion on my part. My diet is closer to a vegetarian diet (eat fish maybe once a week) than to the diet of the average meat eater.