Avoiding news reduces your knowledge of the world around you and therefore reduces your effectiveness in decision-making and functioning in society. If you're going to be a citizen and vote, you need to pay attention to the world around you. Personally, I consider it a citizen's responsibility to be informed. However, many people abdicate this responsibility.
TV news is certainly not as comprehensive as NPR, PBS or newspaper coverage, but at least it gives you some concept of what's going on in your area. It is often shaped by entertainment value, but it's better than no news at all. If you don't like it, simply seek other forms of news which are more comprehensive - even online sites. Just don't spend your time getting political propaganda from publications, radio stations or websites which are highly partisan on either end of the spectrum.
My basic sentiment: ignoring the news is hiding your head in the sand. Spend at least some time being aware of what's going on.