I don't think it takes a complex morality to figure out that animals shouldn't be subjected to concentration camp-like conditions. Eating meat is natural and will never stop, unless resources are so scarce that it has to, but that doesn't mean that meat has to be cultivated with careless cruelty, which is more or less what's currently going on. And yes, we are a cosmic blip destined to become extinct, but that doesn't morally absolve us from trying to minimize suffering through reasonable measures.