john titor
Captain
Well, if the aliens decided we were food, then I am guessing from their perspective it is justified. Otherwise why did they decide we are food?if the tables were turned and some alien species decided you were food, you would have to accept this, even though from your perspective and from the aliens, it wouldn't be justified.
Now, if we develop ways to grow meat in vats, I have no problem switching to that instead of using livestock, depending on which is more efficient.
My meat eating does draw a line based on my own standard of intelligence levels. I could never eat a primate nor a cetacean (is that the right word? whale, dolphin, etc?) and I might have problems with anything I have anthropomorphized like a pet. This in no way affects my ability to enjoy beef, chicken, pork or seafood.
That's where I'd be halfway in agreement with you. While the animals mentioned still have sentience its at a really low level to render it a meh decision imo as to whether to eat them or not, however the fact remains that there can be no ethical justification for it in most circumstances, with exception of starvation etc. As for aliens, they wouldn't have any right, just as we have no right to eat other lifeforms, their reasoning would be flawed as they would have no way to objectively justify it.