You and another commenter missed a crucial part of my sentence: dialectics.
The method of isolating the contradictions of a system so as to arrive at the best possible answer. No one said there is a quick formula for this, but that doesn't mean it shouldn't be attempted.
It is much easier to tell if someone is free to say what they think than it is to tell if they are properly employing dialectic techniques.
If you can't tell truth from lies how are you sure something is misinformation?
What's the point of the term misinformation then? Most people agree upon the shape of earth anyway, but questionable topics are questionable due to, you know, lack of persuading argument which would persuade the bulk of people.