I don't think every type of author should do it for obvious reasons but if the big news companies and writers for big news companies knew that their "certification" was at stake it would have an impact on the quality of writing. It would make sure companies got it right over getting it first or mislead the public with false information.
You are referring to private companies that are profit driven. Lawyers and accountants have a judiciary responsibility to not only the public, but the government. It’s an apples-and-oranges comparison. Again, the public has an equal responsibility to weed out the junk. For example, would you require such a licensing for writers of The National Enquirer, Gawker, TMZ, etc.?