Personally I do honestly think that Dungeons and Dragons is merely a game and that one particular Dungeons and Dragons player losing his mind is not enough evidence to suggest that it is in fact evil.
What about all the people who have played Dungeons and Dragons and haven't become involved in Satanism? I think most people are probably aware that any so-called "magic" involved in games such as these is entirely fictional and that "real magic", which obviously comes from Satan is something to be avoided. Games such as this do not involve "real magic", although admittedly they could probably provoke an interest in a few people, I do think that the vast majority of people are sensible enough to just enjoy the game as it is and then leave it at that.