the best comparison for how people like Jefferson viewed slavery is how we in the west would view sweatshops today: "ah how terrible, what injustice, someone should do something about this ... after I buy this cheap laptop". (and he wasn't even the worst - as I said he at least tried to use his power to do something about it; a lot of politicians sat on their backsides and did the equivalent of citing "trickle down" incrementalism).
A more accurate comparison might be to imagine modern Jefferson as owning sweatshops and profiting off them, while at the same time claiming to deplore them.
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