Brandonn, wait about 48 hours and head back in. I won every single speech challenge in the mediation path and everybody sill dies not long after you complete the mission.

I've been thinking about what my character might do in this situation. He's a Regulator and has been deemed the Last, Best Hope for Humanity. So the regulator half knows justice must be delivered (even without a finger to take) but the humanitarian almost wants to walk away from the whole mess.

It's amazing how much this one, standalone sidequest has made me question my morality more than anything in the main quest.