Is bias always bad?
Since there will always be people who disagree, who should be the arbitrator of what and who is biased?
The point of news is to inform. All persons are biased so it is important that methods be in place to remove as much bias as possible from the news. Methods like two sources, two reporters, an editor who isn't vested in a story, etc, are devices used to that end.
It isn't really possible to argue that because people have different points of view that bias be ignored. Assuming or permitting bias removes the notion of validity and truth from the story because it can be said everybody does it making it propaganda or even fake news. Papers do have reputations as either conservative, liberal, communist, christian, etc. However the news they present , if it reflects that bias, doesn't permit the reader to form her own opinion based on the evidence in print. Most good papers reserve obvious bias to the editorial pages and advertising.
If one wants to build a hierarchy of validity one starts with those who are open and provide evidence in a structured and repeatable manner. New papers and news casts tend to adhere close to those principles for news because doing so provides a basis for delivering truthful and accurate information upon which anyon can make use of those 'facts' as part of their understanding of what is going on in the world.