The Jungian Psychology reference makes me think that it's what The Sunday Slimes grabbed for their reference when they published their D&D is evil article many years ago (and probably still do on a regular basis, but I don't read the Sunday Times any more). This had the accompanying photo of the Demon from the front of the Players Handbook (or the DMG?), carefully cropped to not show the PC's fighting the Demon :)

While we're at it:

http://www.jesus-is-savior.com/False%20Religions/Wicca%20&%20Witchcraft/harry_potter_is_of_the_devil.htm