Englishmen who wrote about liberalism during the abolition of slavery made it very clear that it was explicitly about morality.
And industrialization enabled slavery in the US rather than killing it, thanks to the Jevons paradox; the cotton gin allowed for land previously seen as unsuitable for cotton production to be bought up by slaveowners, increasing the demand for slaves (https://www.archives.gov/education/lessons/cotton-gin-patent ; see section "Effects of the Cotton Gin").
I don't recognize your concept of "superexploitation" in the first place.
Englishmen who wrote about liberalism during the abolition of slavery made it very clear that it was explicitly about morality.
And industrialization enabled slavery in the US rather than killing it, thanks to the Jevons paradox; the cotton gin allowed for land previously seen as unsuitable for cotton production to be bought up by slaveowners, increasing the demand for slaves (https://www.archives.gov/education/lessons/cotton-gin-patent ; see section "Effects of the Cotton Gin").
I don't recognize your concept of "superexploitation" in the first place.