If voting is about choosing the right policy, and the right policy means finding out the consequences of different policies under consideration and then making a choice based on that, then the more informed you are, the more likely your vote is going to lead in the direction of a good policy as opposed to a bad one. Everyone is going to benefit from the good policy that results from your vote. But if voting is about just deciding how to just divide up the spoils between your class and the other social class, then more debatable whether you’re making the world a better place by finding out what’s the best way to tilt things in your group’s advantage and voting in that way.
Do you see how heavily following the news is tied with politics? It really is a matter of informing oneself about what is around oneself so that when it is time to vote, one votes with a knowledge mind. Of course, some people vote for tribalism reasons as stated above but those that take what is important from the news take what is most useful to inform oneself to the best necessary state.