The explanations are very clear and thoughtful. I had never heard it until I actually went to train in Canada. When I told my teacher here in Japan what the dojo kun is on the other side of the Pacific he shook his head and then laughed. You are dead on. Children chant out the dojo kun.
Adults ought know better.
The management respectfully asks that you use discretion when applying what you learn here in real life situations. The management also asks that you recognize the potential for moral, legal, and social sanctions against you should you misapply what you learn here. Putting this sign on your door would keep down the printing costs.