There are never two sides to an issue. That would imply the solution is to "show both sides" on any given issue and then you're done, BBC-style. We consider this to be a flawed form of journalism - it substitutes "A vs B" for nuanced journalism and any deep understanding of the subject matter. You'd never know of the disagreements between climate change scientists because the whole problem is presented by the media as "does it exist at all vs doesn't it?". It also ignores the most prevalent form of bias - simply running stories on a given subject more/less often, or pointing out certain characteristics of people more/less often, and so on and so forth.