This last letter is the one with which I tend to agree. Television watching is passive. Besides the physical act of actually turning on the TV set, nothing more needs to be done. Watching TV involves sitting . . . and sitting . . . Using a computer is an entirely different experience.
Computer use is interactive.
Yes, computer monitors, whether CRT or LCD, are similar to TV screens in their form, but certainly not their function. Simply turning on a computer is not enough. One must do something to the machine to make it operate. People who like computers find them fun because they are actively doing something while using a computer. There are many similarities between the two mediums.