Her anti-slavery 1833 argument is awful. She’s looking at those times through a 21st century lens. You need to look at it through the lens of the times the events happened in. Do you think slave owners would have been willing to listen to the argument that slavery is wrong and they should free all of their slaves? Of course not. That would have been financial suicide. The intelligent way to approach this issue would be to convince them that there are economic benefits to not owning slaves or at least paying slaves. That would have at least been a start and would have made their lives a little bit better.