So, this song isn't Disney per se, but I thought it was interesting in the context of our discussion of villainy and the nature of evil on Monday (If you haven't seen Wicked, I hope this won't spoil anything for you).  The part most pertinent to our good vs. evil discussion starts around 2:36.  I think the most relevant quote is when the Wizard says,

There are precious few at ease

With moral ambiguities, 

So we act as though they don't exist.

For some context, in this song Elphaba (the Wicked Witch of the West) is confronting the Wizard about some questionable things he has been doing as ruler of Oz, and he is essentially trying to argue his way out of being viewed by her as a villain.  I think it relates back to a lot of our discussion of what actually constitutes evil or villainy and how it can be difficult to define.  The song also brings up how perspective can drastically change how a figure (or his or her actions) is viewed.