The world at large is pretty complex, but participating members of a democracy often need to take simple decisions based on that complicated web of information. Society's evolution and functioning requires that we take those decisions.
In many cases it's not possible for all individuals to understand because it would very time consuming and one may not have the training to do so either. So we need the help of journalists and agencies to make sense of the world.
I agree that the availability of sources where it is reasonable, should be made to the public. But that is also not always possible, since it may, in some cases, expose the sources to danger.
A consequence of this is that since we rely on intermediaries to simplify information for us, we are vulnerable to malicious propaganda conveyed by agents disguising themselves as trusted authorities.