Good men have to make basic assumptions about people that simply aren't true in order to intervene. The better they are, the more helpless they'll be.
Men have no better angels and they are domesticated animals by nature.
The Amud will never stop the Melonhead from taking back his slaves. Never. They were made to serve and any era in which they do not serve is a temporary aberration soon to be remedied by them.
The Amud are one species of biped on this planet who achieved a better way of existing but it was not something that could be spread to others who are too different in character from his race.
It's like trying to put your foot down to prevent a man from retrieving his goats. They are his property, are you sure it is the right thing to do to try to stop him from taking back what belongs to him? They want to go into the paddock. It is in their nature. If you tried to stop him from reclaiming his property ... the next thing you feel is goats butting you from behind. They want you to get out of the way. They are dumb brutes who cannot imagine the world the way you do. They want their water and their fresh straw. Their master will give these things to them.