I completed the Mourns-for-trees quest with just myself, Dak'kon, and Morte caring about the trees, so I never got to see the dialog from the other characters; since that was just about the first thing I did in the Hive and I did everything else there before going to the catacombs, I don't really have a suitable save to go back to to try to get those dialogs unless I replay quite a bit of the game. While I'm sure there's other dialogue I missed on my playthrough, since I did just about everything I imagine most of the rest would relate to an evil/chaotic character. Anybody willing to share what everybody says when you ask them about the trees?