When you watch television, or television on your computer screen (that makes no difference) you get hypnotized by the tube into a passive state of consumption. Watch people when they watch TV. Watch their slack jawed faces when the commercials stay on and their attention stays glued to the advertisements pitching Alzheimer drugs. Critical though suspended, minds off in space.
how do you block video on your PC? or do you literally mean audiovisual information broadcast onto actual television sets is the evil?