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So then "It's a fact" that your professor often did not know what he was talking about. I say this cause he must have quoted facts in his lessons did he not.

There are fields where one can cite facts. Politics is not one of them. Of course, if you look at many of the answers given to questions, you find that a rather large portion of them contain far more obvious clues than "It's a fact."

Yes, frequently that is true.

Those that insist they know the facts are frequently incapable of critical thinking and don't understand nuanced information.

It leads to a lot of wrong assumptions.

It is strange, but persons who really know do not often preface their argument by saying that it is a fact. They simply make the comment.