Historiography Is Needed
In this context, we are not attempting to make any kind of political statement. On the other hand, there is no denying that the President of the United States is an excellent example of someone who has frequently spoken with assurance despite being incorrect about the things he is talking about.
This is a pretty embarrassing one considering how simple it is to educate oneself on the history of their own nation, especially given how much of it surrounds them. However, not everyone does research on the things that they are going to say, even though it is strongly recommended that they do.