TV is a bad model for interpersonal relationships. It makes it easier for me to use put-down humor. I ought to just unplug it, I suppose. TV promotes the sin of materialism. TV engenders coveting, materialism and idolatry finding joy in things.
TV is a social evil.
It's like alcohol, or tobacco, or gambling. The net result is socially negative. TV executives argue that there is no connection whatsoever between violence on television and crime in the streets, or between TV's sexual titillation and the behavior of the individuals watching these programs. Yet, the same TV executives will collect a million dollars for a 30-second advertisement during the Super Bowl. TV does change the way we act.