i've never heard of a carnivore who thought meat eating was morally better

By sheerest coincidence, I just tabbed over from precisely that argument offsite. The arguments in favor of meat-eating struck me as rather confused (an odd quasi-Nietzschean will-to-power thing mixed with biological determinism, as best I can tell), but they were moral arguments and they were in favor of carnivory.

I'd expect that sort of thing to be rather rare, though. The mainstream position does seem to be that it simply isn't a moral issue.