There's a part of the story where demons are negotiating peace between a town and attacking demon forces. As soon as Frieren hears of this, she says the town is doomed.
Moral of the story is if your problems are caused by a group, don't expect a member of that same group to help you solve that problem.
*Buzz
Wrongo. Greek and Roman traditions of slavery were very, very different from the modern notion of slavery, which is better referred to as chattel slavery.
In that Greek slavery was worse, yes. You'd much rather be a slave on a plantation than be one in the silver mines, being worked to death.