”Eliminating television is not only a practical concern. There are spiritual reasons for eliminating television. Some members of the Waldorf community believe that a being called Ahriman is especially present in electronic media such as computers and the Internet. This might help explain why Waldorf is so adamant about eliminating television for children, even when the American Association of Pediatrics says limited TV is OK for kids over 2 years of age.”

”Steiner says:..the Ahrimanic influence has been at work since the middle of the fifteenth century and will increase in strength until an actual incarnation of Ahriman takes place among Western humanity.

Now it is characteristic of such things that they are prepared long in advance. Ahrimanic powers prepare the evolution of mankind in such a way that it can fall a prey to Ahriman when he appears in human form within Western civilization — hardly then to be called `civilization’ in our sense — as once Lucifer appeared in human form in China, as once Christ appeared in human form in Asia Minor. It is of no avail to give oneself illusions today about these things. Ahriman will appear in human form and the only question is, how he will find humanity prepared.
Steiner, Rudolf. The Ahrimanic Deception”

http://www.openwaldorf.com/media.html