Grow up and don't be so petty. I was being nice about this- you can keep the sarcasm to yourself
Absolutely nothing I said was sarcastic in any way. If it sounded that way, I apologise for the poor phrasing.
Guess what? Humans do this too! Omega 3 fatty acids are essential to healthy brain, nervous, muscle and repair yet the only sufficient sources of this are from other living things.
Except that, as thinking beings, we are capable of considering whether this is Good or not: becoming vegetarian for example, or avoiding eating each other.
Don't forget that our biology is the source of our views on morality
This is an extremely contentious statement, and not one that can be tossed off with a "don't forget that..." What's more, in DnD its just not true. Morality comes from the Outer Planes: there's a space out there for every moral outlook and the one you're aligned with is youralignment. And DnD is quite happy with races which have evolved to be evil.
They simply cannot understand humanoid morality as their minds are wired completely differently.
It is NOT "Humanoid Morality". It is universal morality. The Universe is, quite literally, built around it, with entire planes devoted to each moral outlook, where every soul goes, not just the human ones. When Illithids die they head out to the Outer Planes just like everyone else.
Look at wolves: they can show affection and cooperate with one another, but they certainly wouldn't treat a sheep that way- they'd eat it as it is their nature and need to do so.
Wolves are not sapient. They cannot think. They cannot make moral choices, so nothing they do can be moral, one way or the other. Illithid can not only think, they are an entire race of geniuses. The comparison is invalid.
You've already admitted that Illithid have evolved to feed off of and maintain groups of humanoids for food. Are you saying that evolution is evil?
Evolution has no moral value, good or evil. What its sapient products do with the results of it, does.