Television and computers are addictions, alternative drugs to take them away from reality and interactions with other people. My STBX is also addicted to TV and we spent too many hours passively watching the "boob toob" instead of interacting with each other. When I would try to get him to do something else other than sit in front of the mind numbing set, he would object, sometimes strenuously.
Perhaps the LD/ND people use the TV to validate their existance in some manner. I know that it is used to self sooth on many ocassions. When I am particularly stressed, I will sit mindlessly in from of the TV or computer, so I am also guilty of the passive behavior.
Never could get that man to turn off the TV or computer and come to bed, ever.... Especially if I wanted some loving, he would stay up late and not come to bed until he knew taht I had fallen asleep...