Humans are omnivores. How is it wrong?
Capability of eating meat is not the same as morality of eating meat.
For instance, humans are perfectly capable of cannibalism, yet it is perhaps among the most repugnant concepts to many people.
Likewise, I doubt you would look at humanity's lengthy history of mass rape and murder and use that as a moral argument in favor of those things.
"Because we can" and "because we always have" are not convincing moral arguments.