The question is NOT "what gives us the right to kill other animals for food?"
As explained in the last 2 pages that would be a silly irrational question. I don't know if you are aware of it or not, but you actually did ask the right question, which no one has addressed yet.
the question is, "What gives us the right to devalue life and think of it in terms of a product?"
We give ourselves that right because we think that we are superior to animals and whatever we do is justified as long as it benefits us, and that everything in the world should exist soley to benefit us.
Animals kill other animals for food. Animals do not devalue life and think of it in terms of a product.
Animals will kill another animal in their territory that they perceive as a threat, even if it does not attack them. They will not kill another animal outside of their territory. Only we do this.
Animals will kill another animal that is trying to take it's food. They will not kill another animal that is not trying to take it's food, even if that animal lives off the same food supply, and will try to take it later. Only we do this.
Animals will kill another animal and eat it when they are hungry. They will not kill another animal when they are not hungry. Only we do this.
An animal will take food away from another animal when they are hungry. they will not try to take food away from another animal when they are not hungry. Only we do this.
An animal does not think that it is superior to any other animal. It lives in a balance among the other animals.
The reason for this is because they all obey the laws of competition. these are not laws like we have. our laws are just things that people made up and whether or not they are based on proven principles or whether or not they work is irrelevant. a natural law like the law of competition is a law because it was formed through trial and error over thousands or millions of years and it is followed because it is what works best.
The reason that this law works best is because it creates a lifestyle that is consistently sustainable.
Survival of the fittest is a cultural myth of ours. A lion can kill a gazelle, and in fact, among animals that live off of gazelles for food, no other animal can compete with the abilities of the lion. So the lion is obviously the most fit species ... so shouldn't that mean all the other creatures have a reduced chance of survival? there is no shortage of gazelle, they have no problem surviving, they are not going anywhere, and the other animals that compete with the lion for food, they are all thriving as well.
Survival is dependent on competition. Any animal that cease to obey the laws of competition reduces it's own chances of survival, because it creates a lifestyle that is not sustainable.
If lions did what we humans do and imaged that they were superior to all other animals and the laws of competition did not apply to them then two things would happen.
They would kill all the animals that competed with them for food, so that they were the only one's that had food. And then they would kill all the competitors of their food's food. they would make a world with only grass and gazelles and lions. Sounds pretty good for the lions right?
The problem is that they have reduced their chances of survival down to virtually zero. Any change at all in this system will wipe them out. If there is a famine or a drought and the grass dies, the gazelle die, the lions die. end of story.
Also with no competition their reproduction rate goes through the roof. They made more lions which eat more gazelle, until there is not enough gazelle to feed the lions. they will not stop at this point because they believe that they are superior, that the laws of competition do not apply to them.
As it stands for us right now the number one cause of death worldwide amonst humans is starvation. The process through which we produce our food and subsequently through which the same attitude is applied to all other facts of our existence, we kill everything else that is not our food. Since the laws of competition apply to us and our food, even if we think they don't, eventually we will have wiped out all the other species and conditions that are necessary for the growth of plants, which means our food dies, which means we die.