Aristotle's Principles of Morality and Morality, Okay?

Aristotle says it's not okay to enslave people that you have captured in battle. Just because someone was on the losing side of a battle doesn't mean they aren't personally individually capable of self-government, right? As slave as someone who's not capable ofself-governance, Achilles could have been like, you know, you might not be the best example of practice. Or this could have been captured on the field of battle, right? Does that mean that he's not incapable of self-governance? It doesn't mean that at all, right?