I don't see the problem here.
START RANT
In my life's experience and my teachings I have never found a reason to sugar coat or try to make someone feel better about being wrong. The hobby we enjoy and lessons I teach are far to important for someones feelings to get in the way of the facts. The old saying goes that the truth hurts. If you try to down play someones completely wrong and potentially fatal concept than they will think "there's is simply another way of doing it" but if you stick that stinky idea under their nose and force them to smell it they will know without a doubt they are wrong. Why do you think that the drill instructors in boot camp are so brutal and viscous when you do wrong? It's because we remember bad experiences better than good ones, so if someone gets in your face and tells you to keep your blankity blank head down when under fire you blankity peice of blankity blank you will remember that much more clearly than if you were sat down with some cookies and milk and told a happy little story about how little johnny kept his head down while under fire and they all lived happily ever after.
END RANT