Eh, the shitheads have been arguing that slavery was good for the enslaved since the time of slavery. E.g.

Bishop Stephen Elliott, of Georgia, wrote that critics of slavery should “consider whether, by their interference with this institution, they may not be checking and impeding a work which is manifestly Providential. For nearly a hundred years the English and American Churches have been striving to civilize and Christianize Western Africa, and with what result? Around Sierra Leone, and in the neighborhood of Cape Palmas, a few natives have been made Christians, and some nations have been partially civilized; but what a small number in comparison with the thousands, nay, I may say millions, who have learned the way to Heaven and who have been made to know their Savior through the means of African slavery! At this very moment there are from three to four millions of Africans, educating for earth and for Heaven in the so vilified Southern States—learning the very best lessons for a semi-barbarous people—lessons of self-control, of obedience, of perseverance, of adaptation of means to ends; learning, above all, where their weakness lies, and how they may acquire strength for the battle of life. These considerations satisfy me with their condition, and assure me that it is the best relation they can, for the present, be made to occupy.”

Adapted from The Great Stain: Witnessing American Slavery by Noel Rae. Copyright © 2018 by Noel Rae.

It's a twisted argument now, just as it was then, but it's hardly new.