You don't. You have to put in the work to understand the particular bias and reputation of each sure you read. And then you have to seek out additional sources

You don't. You have to put in the work to understand the particular bias and reputation of each sure you read. And then you have to seek out additional sources that are biased in different ways so that you can see all sides of the debate. There ain't no such thing as a free lunch (TANSTAAFL).