You are quite correct in what you say. Didn't mean this to come across as a diagnosis, just an example of how it is a waste of time to use reason and logic with some people.
I think that this poster is trying and struggling with this issue. I can think back to when I first started teaching (at my teacher's direction as opposed to my preferred choice...) and all of the issues that I struggled with. Instead of giving me directions to some of the issues that arose, my teacher would remind me that my over-riding responsibility was toward protecting the class. This forced me to think through how my choices would not just effect one person, but the entire class. Not many easy answers exist when you are in charge....