“Maybe Lincoln didn’t understand what was going on as well as Paul Finkelman now does, but I regard that as unlikely.”
So do I. The notion that the nation could have been founded as one without slavery is profoundly historically ignorant. The Founders did the best they could do under the circumstances, and even with such an atrocious flaw it was still the best design of a government in human history up to that time.
Or since, despite the fact that about half the nation seems willing to abandon it.
[Update a few minutes later]
This seems related.