One of the tragedies of slavery - like other severe forms of oppression - is that it doesn't ennoble the oppressed. In fact, it makes the enslaved person accustomed to cruelty, violence, iniquity, tyranny; and is likely to result in individuals who tend to be possessive, anxiety-prone, vengeful, violent etc. A bit like the adage about abused children growing up to become abusive parents.

(Of course, this too is a crass generalization.)