Earlier quoted context omitted.
You are perhaps poring too much over the detail. I've no idea how you get to burning the whole building down, my rationale for conveying the importance of respecting standards, legislation and plain human decency was pretty clear I think.
The rationale I see here is that 'disrespecting' standards means we should cut off the nose to spite the face. Why didn't you decide the building should be burned down, rather than just closing the offending restrooms? Or if not burned, closed temporarily? Or, per your example, what is the difference if they leave the restroom open but specifically disable the urinals, letting people use the sinks to wash their hands…
The reason you would require the functioning facility to be closed is to make it clear to the business and all others there are consequences for this incompetence and lack of care.