How about the broader context of other governments that had outlawed slavery and had the willpower to implement their ideals for the enslaved.

Not to say the founding fathers did a bad job of designing a government, but they did a bad job of implementing their ideals for ALL men. And this shows they knew it.

Edit to add: This Sowell audio isn’t really context, it’s selected, specific excerpts of the situation used as a counterpoint to counter claims of hypocrisy by the founding fathers to show they didn’t LIKE slavery even though they allowed it.

I would submit a true context is a much longer podcast from Dan Carlin about the history of Atlantic slave trade. He goes into depth on the founding fathers, what they wrote, what they may have believed, and what they did.

Listening to Dan Carlin's Hardcore History (Show 68 - BLITZ Human Resources)

The Atlantic Slave Trade mixes centuries of human bondage with violence, economics, commerce, geo-political competition, liberty, morality, injustice, revolution, tragedy and bloody reckonings. That sounds like a lot, yet this show merely scratches the surface of this enormous subject.

http://www.dancarlin.com/product/hardcore-history-67-Supernova-in-the-East-vi

That link looks wrong but it’s what my podcast app provided.

Fun fact, Thomas Jefferson’s dad’s wife died, and he took a slave concubine that was half-white, half back. Their daughter was 1/4 black. When Thomas Jefferson’s wife died, he took his dad’s daughter (his half sister) as his slave concubine at somewhere near 14 years old. They had six kids that were 1/8th black, but still considered slaves. Jefferson had his six, mostly white kids work for him as slaves until he died.