If you don't think "Breitbart is not a credible news source" is not a valid point then oof, yikes, etc.
I don't think any of the major news networks have much credibility any more, it's just that some may seem better than others simply because they align more with your particular personal opinions and biases.
The only approach I've found is to consume a few news sources through the lens of their known biases in an attempt to get something resembling the whole picture.