I’m not humanizing animals. I just acknowledge the fact that they are sentient beings that are capable of feeling pain, physically and emotionally. That enjoy certain things and dislike other things. Is it okay to torture a dog because wild dogs get into fights where they get hurt terribly?
Of course animals in nature are killed brutally, but so are humans. It’s totally natural for bears to kill humans. Does that mean we can also kill humans? See how this doesn’t mean anything for the question whether it’s immoral to kill animals or not? I wouldn’t even necessarily disagree that it can be morally okay to kill an animal, given certain circumstances. The argument “in nature, animals are killed brutally” just has absolutely no implications for human ethics. Animals and “nature” have no concept of morality. Humans do.