the question of the worth of a life, and whether a human life is worth a lifetime of meat eating/killing.

Yes, this paradox is the root of it, I think. Is it ethical for me to live while that requires killing a lot of something else? I don’t think there is any “right” answer since it all depends on what you consider to be worth more (which is also why opinions on this are interesting). I guess generally people don’t tend to say you should kill yourself if you end up in a situation like this, since it could happen to anyone with some really bad luck