Let me put this another way.
The monsters are not stand-ins for the Other, but are designed as antagonists in the game that our players must overcome in order to progress. They are designated as evil creatures not because they stand in place of the Jew, Moslem, Black, or White but because it is the fundamental truth of the game that human beings – the people playing this game – are by and large good people. They are our contrast and our opponents; and without the conflict created by trying to overcome them there would be no game.
 Gygax, Gary. Role-playing Mastery. New York. Perigee Books, 1987: 26 - 27.