"The area they were standing in and singing is an area that is restricted for this type of activity,” said Sgt. David Schlosser. “The United States Park Police is absolutely content-neutral when it comes to any sort of demonstrations in these areas.”
They consider singing in a group a demonstration.
Now ask yourself, what is a demonstration? It's for advocacy for or against a position or behavior.
Singing patriotic songs is a demonstration? For or against what? Answer that question and you see what this rule is all about.
The rule is a null, a cipher. It is there so that it can be used to allow or disallow at the subjective will of the enforcer.
“I agree with this 100%. This is a MEMORIAL folks.”
Big friggin deal. The way in which individuals choose to conduct themselves at memorial sites are their business, provided they are not desecrating or vandalizing property,and/or threatening/harming individuals.
I guess behavioral modification, if you will, is acceptable in this instance. Arbitrary censoring is fine in this case? I don’t need some Park Police telling me how to behave in public if I’m not braking any laws. If you find public displays of patriotism in such places annoying, or disturbing to your peace, I suggest you visit memorials late at night. No one is denying you of that, but don’t deny us the right to live freely, even at memorial sites.