I had no idea that there were little buttons to click on to raise my stats with each level up until the final level. No wonder I thought this game to be impossibly difficult.
But to get to my point, you can learn a great deal of morality from rocks. Rocks never bother anyone, and they do not retaliate when they are harmed. From rocks we can learn not to bother anyone, as well as patience and tolerance.
And trees are extremely conscientious. Left to their own whims, trees will spread out their branches to cover a lot of space. But when a tree is with many other trees within a forest, its branches with not spread out. The tree will grow in such a way as not to stick its branches into other trees. So from trees we can learn to restrain ourselves from causing discomfort to those around us.
Oh what the hell, I just can't resist! The fundamental flaw in this genre of games (and video games in general) is that you are limited to what the creator thought of.
For example, one of the guys you debate mentions that morality obviously doesn't come from trees and rocks. Well as someone familiar with Taoist philosphy, that's just the sort of thing that comes to mind for me. (Speaking of which, where were all the Chinese philosophers in this game? Oh yeah, how silly of me, Eastern philosophy revolves around shutting up and listening to what people have to say, rather than litigation, so those guys wouldn't know how to argue at all.)
Actually the arbiter is correct; there is no point to what philosophers do, and they should all quit trying. Accounting is a much more useful profession.