I have been ignoring dungeons because the loot isn't great and neither is my millitary. However, I noticed recently that my people(human) have been marrying hostile humans in the dungeons. The don't become non-hostile when this happens either, which would have been cool.
Hahaha, ya, I've known about this one for a while. I haven't fixed it because it's pretty interesting. I may make a change so they join your settlement or, at least, ask.