More to the point, it's actively abused. You can't say people aren't allowed to lie, so they can heavily editorialize or even outright fabricate and still call it news. Because the average person watches the news to be told, not to think, networks that do as above in a way that reinforces people's preconceived notions are rewarded with viewership. In an effort to regain viewers, the so-called "legitimate" networks resort to cheap gimmicks and demagoguery of their own, and the actual news gets lost in the scuffle.
One of the best parts about having an independent public broadcaster is that they aren't slaves to viewership, and by association ads. BBC, CBC, NPR, PBS... all have quality news programs. CNN, Fox, MSNBC... not so much.
That's a tad bit of hogwash. PBS and NPR are not neutral parties. They have to appeal to viewership just like everyone else. They ask for donations and corporate sponsorship.
I think you can see the difference in their appeal, however. NPR and PBS need to attract enough viewers to keep their programs going, which are made fairly cheaply. The BBC and CBC are government-funded, and have never really operated with an eye towards profitability. You can argue that they aren't objective news sources, but the quality of the news they provide is still much better than on the big US networks.
Not being for-profit doesn't mean there's a lack of budget concerns. BBC World Service will be cutting around 650 people over the next few years. Let's hope they can still provide high quality service.
PBS stations have been having a tougher time than in the past. Costs are rising, they've lost some of their audience to the greater variety of things people view on cable and the net, and many viewers are being tighter with their money.
Even when all sources are truthful, perspectives and emphasis differ. It's good to have a variety of sources available.
A number of international news networks including Aljazeera English are carried on MHz WorldView. It's seen on some cable systems, carried by some public tv stations over the air (often as an added digital sub-channel that many not be on their cable line up) and on direct tv. They can also be seen streamed on demand to those with ROKU.
One of the best parts about having an independent public broadcaster is that they aren't slaves to viewership, and by association ads. BBC, CBC, NPR, PBS... all have quality news programs. CNN, Fox, MSNBC... not so much.