I am a retired newspaper journalist. What do you know of journalism? 
I do! A journalist is someone who writes or distributes news to the public.
What are the responsibilities of a journalist to the public discourse? 
They are meant to collect, write, or distribute news or even other current info to them and that is their responsibility. 
So is a journalist for the national enquirer the same as a journalist for the BBC?
Journalist
A journalist is a person who collects, writes, or distributes news or other current information to the public. A journalist's work is called journalism. A journalist can work with general issues or specialize in certain issues. However, most journalists tend to specialize, and by cooperating with other journalists, produce journals that span many topics. For example, a sports journalist covers news within the world of sports, but this journalist may be a part of a newspaper that covers many different topics.
Roles.
issues, with constructive journalism the journalist also addresses what the consumer can do with the information. What can I do to change it? etc. 
The journalist does not reflect his or her opinion and also does not render or implement what those solutions are, but tries to inform the society of what solutions there might be. Pioneers of constructive journalism say that as a journalist you have a big impact on the way people think, because of the way you construct the news. Journalists need to be aware of that responsibility