Anyone who uses that in an argument is sure he is absolutely correct with his argument.
Anyone who is sure they are absolutely correct with an argument, at least one with a topic like this, is a moron.
Because if you are "sure", you are defacto stating that you know everything there is to know about the subject, and considered every possible viewpoint, analyzed every possible shred of evidence.
And that is literally impossible in practice.
Congrats, you basically called yourself closed minded and you have the audacity to pat yourself on the back for it.