This isn't exactly an answer to your question, but coincidentally, the current weekly Torah portion, Acharei Mos (Leviticus 16:1-18:30), includes the Yom Kippur ritual involving the two goats. One interpretation of the ritual is that one goat represents the good inclination and the other the evil inclination. Here's an article by Rabbi Jonathan Sacks on the subject:
http://www.rabbisacks.org/covenant-conv ... scapegoat/