That's a problem specific to news reporting, not journalism as a whole. I consider news reporting seperate from investigative journalism. What happened is far easier to report and consume than a report on why it happened. So, a better filter against biased news reporting, better than averaging, is taking a longer view and reading more comprehensive analyses. You can spin everything, but I find the more the article tends towards a study (investigative journalism), the blatant spinners drop off exponentially. Any bias is usually clear in such texts and therefore easily accounted for.