If the park is closed, they have to leave. Period. And at some point this evening, the park closed. Move on. Protest somewhere else. Is that all that difficult to understand?
Whatever you say Mr. Government. Please let me know if my protests are bothering you.
In my (somewhat limited) experience, even in a non-contentious situation, if one is in a park that has personnel come around to shoo people out for closing, said personnel do not wait until closing time to start asking people to leave. In this case I believe the 7 pm curfew set the closing: If a large crowd was present, given the prior nights’ trouble, the security people even less a POTUS stroll through would start asking people to leave at, what, 6:30 pm at the latest?
My question here is, did the protesters balk at leaving?