I see your point- and you are right, a world where we do less harm is better. It's all grey areas though. Extending your example, if it was a choice between the death of 3 million chickens or 3 million whales, personally I would choose the chickens. 3 million cows or 3 million whales, however, has different implications. Even more interesting is smaller numbers- 300 cows or 300 whales? Considering how you get so much more resources for the same amount of harm in whales, I would probably choose whales.