Journalists have a responsibility towards facts that is just as strong as a scientist's responsibility towards facts. The major difference is that journalists are not necessarily expected to discover facts, but report on them, which greatly shifts their scope of attention.
Helping readers draw connections and get context is valuable, but only if it's done within the facts. A journalist or a publication that reports something that is factually wrong has to loose credibility.
Reporting something as fact when it is merely speculation is a milder form of reporting something that's factually wrong, but it's almost as deserving of our criticism.