“Unhappy slaves cannot even move their lips to say a single word. Any murmur is checked with a rod; not even involuntary sounds—a cough, a sneeze, choking—are exempt from the whip. If a word breaks the silence, the punishment is severe. Hungry and mute, they stand all night (…) We abuse them as we do pack animals (Nardo, 51).”
All of that mistreatment was normalised in those societies because of objectification. Rebellions were crushed without mercy, such as Spartacus’s, in which the 6,000 surviving slaves were crucified along the Appian Way, dying cruelly as they were pecked by carrion birds.
In the Zanj rebellion in the Abbasid Caliphate—specifically in what is now Iraq—by slaves primarily of Black origin, but also Iranian and Maghrebi, estimates suggest that between 500,000 and 2.5 million people died.

Some will think all of that is water under the bridge. NO! Besides the fact that in some places slaves, women, children, and other types of humans continue to be objectified, there is a vast reduction to merchandise when it comes to non-human sentient beings.
We continue to seek the best life for ourselves and our loved ones at the cost of turning others into mere objects. For example, if we can, we make the best plans, the best getaways and holidays to the best destinations and hotels within our reach, with swimming pools and—of course—a buffet with good meat and fish, but at a good price, even if it is at the cost of exploiting and mistreating non-human animals in miserable conditions for life.
At dinner we will be as pleasant with our family members or friends as the ancient Roman patricians were. We will have as much fun as they did, we will even joke casually and laugh as they did, but with one difference: we will take a photo or two with those typical beatific smiles that make it look as though we are very nice and incapable of hurting a fly.
But all of it is merely a facade, a pretty cardboard set like the one the Nazis used when the Red Cross went to inspect the extermination camps.
Because behind our charming smiles and our kindness lies the harsh reality caused by our objectification: the genocide we commit against non-human animals, reaching astronomical figures on a scale that has nothing to do with the greatest human holocausts, such as those caused by Communism in countries like China (40–80 million), the Soviet Union (tens of millions), or Cambodia (1.5–2 million); by nationalisms such as German Nazism (16–17 million), Japanese nationalism (10–30 million), or Turkish nationalism (1.2–1.6 million); or by religions such as Islam (tens or hundreds of millions) or Christianity (millions): more than 2 TRILLION—with a T—animals are killed every year! 20 TRILLION in a decade! Consider that the entire human population currently amounts to 8 billion.

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This is not only a large-scale crime, but one carried out with a considerable level of cruelty. The vast majority of these killed creatures have lived in appalling conditions in industrial farms, fish farms, laboratories, etc. And many have been abused. They are usually kept in the minimum amount of space, as that is more profitable, just as happened with the maritime slave trade.
To commit so much evil against innocents, it is first necessary to objectify them, which makes it possible to switch off empathy, so we mentally resort to supremacist speciesism and anthropocentrism.
But no sentient being is a mere object!
FOR A WORLD WITHOUT HARM: Let us not be supremacist speciesists
THE ART OF LIVING WITHOUT HARM: Let us say no to exploitative anthropocentrism
To re-empathise and de-objectify, let us put ourselves in their shoes. In fact, for some time now, news has been appearing in the press about possible extraterrestrials arriving on Earth. Well then, imagine that they believe they are superior to us, that they consider us simple objects for their use and enjoyment and that, therefore, they can do almost anything they want with us. Picture them labelling us as mere elements to be trampled, as the Nazis did with the Jews.
So they abduct you and your loved ones and do to you all the things we do to other species. How would you feel?
Since you are a sentient being, all of that harms you, but they do not empathise with your suffering, because they consider that, since you do not have the right label, you do not deserve compassion or rights.
Do not do to others what you would not want done to you!
Thank you for sharing if you aspire to a world in which people and other beings who feel are not reduced to mere things,