Facts are nothing more than a consensus opinion, meaning educated guesses. When someone says, “The fact of the matter is….” their argument would not come across so strong if they said, “The educated guess is….”. Consequently, an opinion, stated as if it is a fact, by a good speaker can be made to sound or come across as indisputable.
Remember, also that a so-called fact may be more of an “exception” to the rule instead an “example” of the rule. Anyone can distort the facts and be wrong.