Isn't that precisely what segreagtion and slavery was all about, that non-white points-of-views, quality-of-lives were not of importance even consideration by the white oligarchy?
Your constant framing of history as Whites against the world isn't accurate. Slavery has existed (on record) for at least 3-4,000 years. It still goes on today, and it's never been exclusively white/black binary (which is hardly even possible given the huge diversity of both white & black cultural / ethnic groups).
From Wikipedia (ymmv):
Why African slaves?
In the late 15th century, Europeans (Spanish and Portuguese first) began to explore, colonize and conquer the territory in the Americas. The European colonists attempted to enslave some of the Native Americans to perform hard physical labor, but found them unaccustomed to hard agrarian labor and so familiar with the local environment that it was difficult to prevent their escape. Their lack of resistance to common Old World diseases was another factor against their suitability for slavery. There was already a small traffic of African slaves to Iberia in the 15th century through the kingdom of Granada or the Iberian outposts in Africa, creating the Black Ladinos, African slaves who had learnt the language of their masters. The Europeans had also noted the West African practice of enslaving prisoners of war (a common phenomenon among many peoples on all of the continents). European colonial powers traded guns, brandy and other goods for these slaves, but this had little effect on the Arabian and African trade. Compassion for the suffering of the Native Americans prompted Friar Bartolomé de las Casas and other men of clergy to propose Africans as more suitable. Las Casas would later lament all slavery. The African slaves proved more resistant to European diseases than indigenous Americans, familiar with a tropical climate and accustomed to agricultural work. As a result, regular trade was soon established.
Source of slaves
All three slave-trading routes tapped into local trading patterns. Europeans or Arabs in Africa very rarely mounted expeditions to capture slaves. Lack of people and the prevalence of disease prevented any widespread gathering of slaves by Europeans and other non-Africans. Local rulers were very rarely open to allowing groups of armed foreigners to enter their lands. It was far easier and more common to make use of existing African middlemen and slave traders. Slavery has been present in Africa for millennia, and still is today even with children, though some historians prefer to describe African slavery as feudalism, arguing it was more like the serfdom system that controlled the peasantry of Western Europe during the Middle Ages or Russia into the 19th century than slavery as it was practiced in the Americas.
The slaves came from many different sources. About half came from the societies that sold them. These might be criminals, heretics, the mentally ill, the indebted and any others that had fallen out of favour with the rulers. Little is known about the details of theses practices before the arrival of Europeans, and so it is difficult to tell if the number of people considered as undesirables was artificially increased to provide more slaves for export. It is believed that capital punishment in the region nearly disappeared since prisoners became far too valuable to dispose of in such a way.
Another source of slaves, comprising about half the total, came from military conquests of other states or tribes. It has long been contended that the slave trade greatly increased violence and warfare in the region due to the pursuit of slaves, but it is hard to provide evidence to prove this; tribal warfare was certainly common even before slave hunting had added such an extra inducement.
For the Atlantic slave trade, captives purchased from slave dealers in West African regions known as the Slave Coast, Gold Coast, and Côte d'Ivoire were sold into slavery as a result of a defeat in warfare. In the Bight of Biafra near modern-day Senegal and Benin, some African kings sold their captives locally and later to European slave traders for goods such as metal cookware, rum, livestock, and seed grain. Previous to the voyage, the victims were held in "slave castles" and deep pits where many died from multiple illnesses and malnutrition. Conditions were even worse in the Middle Passage across the Atlantic where up to a third of the slaves died en route.
Elikia M’bokolo, April 1998, Le Monde diplomatique. Quote:"The African continent was bled of its human resources via all possible routes. Across the Sahara, through the Red Sea, from the Indian Ocean ports and across the Atlantic. At least ten centuries of slavery for the benefit of the Muslim countries (from the ninth to the nineteenth)." He continues: "Four million slaves exported via the Red Sea, another four million through the Swahili ports of the Indian Ocean, perhaps as many as nine million along the trans-Saharan caravan route, and eleven to twenty million (depending on the author) across the Atlantic Ocean"
This issue has almost always been about an arcane world-view; humans as chattel. It isn't bound to specific ethnic groups, to specific areas, or to specific times.