Ok, so you've just defeated the ancient evil and the traitors and whatnot. So, for example, the end of the Lord of the Rings. What do you do now?
You've got all these orcs and goblins and trolls and foreigners who are no longer under the influence of said evil, but for as long as there have been traitors and whatnot and ancient evil they've been living in an evil based culture and they have an evil based economy.
If they don't send out raiding parties to plunder/eat nearby peoples they don't have anything. If they don't make weapons of war then they don't make anything.
How does one deal with changing a culture that was designed by evil for generations with the sole purpose of making them evil?
How does one create economies and food sources to replace the pillaging and eating of innocent peoples, which currently serve that purpose?
What does one do to change these evil based cultures, economies, belief systems, memes, codes, traditions and so forth so that those who are members of species that were on the side of evil can be integrated into the new age rather than exterminated?