How is television not a waste of time?
'A waste of time’ is not receiving or acquiring any sense of enjoyment, education and/or value from the activity you are conducting, and therefore one has not benefitted or has been entertained from doing the activity.
I am not sure that the "most powerful medium of mass communication seen regularly by most persons in the United States" or in the world can be seen as a waste of time. Television is extremely important and relevant to our lives. When the President speaks to the people, the President speaks to the people through television. When the most watched television event in the last 50 years was news coverage of the September 11 attacks, when the symbol of cultural advancement all over the world is the purchase of a family television, I don't think any of these can be considered to be a reflection of something that is "a waste of time." Television is of value to our lives. Whether it is liked or not, television is a part of our lives, providing something of meaning to so many and connecting individuals even more. There are elements, such as specific programming, that might fit the classification of "waste of time," but by in large, the impact of television and the fact that it is so widely shared by so many people both in the United States and around the world makes it an endeavor where it is not a waste of time.
By watching tv, we can improve in our language. We can also learn more about morals and be a better person.