I'm dubious of any moral claim, such as valuing vegetarianism or celibacy, that requires people to act contrary to their natures in a way that decreases their fitness. [...] but when you then conclude that lions are evil for eating zebras, you've gone wrong somehow. I don't buy the argument that the rules are different for humans because they can reflect on the rules.

(Emphases mine). Please settle on a set of applicable subjects. I'm with you that moral claims apply to "people". I don't think many here will claim that humans exhaust that space in theory, or that lions inhabit it currently.