No argument there. I can only add the words of Robert E. Lee:
In this enlightened age, there are few I believe, but what will acknowledge, that slavery as an institution, is a moral & political evil in any Country. It is useless to expatiate on its disadvantages. I think it however a greater evil to the white man than to the black race, & while my feelings are strongly enlisted in behalf of the latter, my sympathies are more strong for the former. The blacks are immeasurably better off here than in Africa, morally, socially & physically. The painful discipline they are undergoing, is necessary for their instruction as a race, & I hope will prepare & lead them to better things. How long their subjugation may be necessary is known & ordered by a wise Merciful Providence. —Robert E. Lee, to Mary Anna Lee, December 27, 1856
Why do you suppose Lee thought slavery was a greater evil for whites than for blacks? After all they weren’t the ones who were property being bought and sold.