Because otherwise their vision of Nintendo destroying gaming with the help of "non games" wouldn't sustent, while truth is that non gaming is an addition to the market, not an attack to the previously existing one.And why is everybody forgetting that Wii Sports costs like 2/3 as much as Zelda, and that Wii Play comes with a controller? And that Zelda isn't as popular in Japan? It's not a surprise that it's 3rd.
Jesus, this topic brings me memories of the early PS1 era, when gaming was gonna be doomed thanks to 3D, "violent" games and CDs in detriment of "true" gaming.