Looking only at the stories from a single news source is not a way to be a critic of the news.
Not all news sources are reliable or trustworthy. In the United States, where the debate over media objectivity is most heated, conservatives criticize the media for having a ‘liberal’ bias and these critics focus on the personal views of journalists, editors and media owners who, they argue, tend to be elitist, left-leaning and politically correct.
Accusations of liberal bias, however, are not new. Richard Nixon and his vice-president Spiro Agnew repeatedly referred to the bias of the media. Corporate executives and conservative leaders attributed the surge of regulation and the distrust of business of the late 1960s and early 1970s in part to the media and what they perceived as the media’s liberal bias. As part of the political resurgence of conservative ideas, they sought to build their own reliable media outlets and to have more influence over existing media organizations.
In this sense, it´s important to read the news from different perspectives, so you can be critical about them. You can build your own opinion and offer to others the reason for that.