Humans are just animals and if it's okay to keep other animals as pets or live stock then it's okay to keep humans in the same manner.
Mark Corske's engines of domination
explains what did happen when humans domesticated humans in the same way that they domesticated other livestock animals like sheep
Youtube link
https://www.youtube.com/watch?v=JWq5YnH6n6c&app=desktop
Archive of youtube link
https://web.archive.org/web/20160816073908/https://www.youtube.com/watch?v=JWq5YnH6n6c&app=desktop
