Quote Originally Posted by Jarmam View Post
It doesn't seem to be worth it in any situation, because the ROI on the public order is way too low compared to higher tech structures. Slaves are a % increase, so theoretically they are worth it as the game progresses, but even 175 turns into the campaign they are still not worth the public order penalty. Maybe as Sparta? Haven't tried a Sparta-campaign, but even with their faction trait I still dont see how it can be worth it in the game's current state.

Sadly this has lead me to kill off pretty much every single survivor of my battles since turn 10. What a waste of resources.
You can free them for diplomatic bonuses. They wont return to their armies anyways.