Interestingly, I took this quote to mean both that reported news is biased, but the decision of what events to report upon is biased too. Being a skeptic solves the first issue. For the second, filtering what you read doesn't help if you aren't reading stories that are valuable to you but aren't tragic / scary / interesting enough for the rest of the news source's readers. Since news sources are biased, how can you know what you aren't seeing?