Yes, white racists are stupid, deluded, and loathsome. Nonetheless,  a little historical perspective would be good here. Yes, the Papacy licensed the conquest of non-Christian lands in 1493 (actually, much earlier), just as the conquest and subjugation of non-Islamic lands, including India, and the death or enslavement of those who resisted,  had been licensed for Muslims.  The Spanish/Portuguese didn't seek to exterminate aboriginals under Papal license, but to subjugate, exploit, and enslave them. Their model was the Reconquista, itself modelled on the Muslim conquest of Spain, but disease foiled their plans for exploitation. 12.5 million black slaves, mostly males bought from other blacks, were transported in the Transatlantic trade, and 11.5 million black slaves, mostly female, were transported in the Trans-Saharan trade (Cambridge World History of Slavery, Vol. 3), where views about the suitability of blacks for slavery seem to have originated.