A change of perspective.
Lets say for instance this was a land question instead of a water
Safe Harbor during a names storm.
whether Fed, state or local, generally can not turn you away from safe harbor (public shelters) UNLESS they are overcrowded, which they can and do. There are other reasons also.
Are you required as a citizen ( just like a private marina) to give safe harbor to strangers in your home or garage or even your business?
The answer is obviously 'no'. Why? It is your private property and you have the right to turn people away.
Just playing here and drawing an analogy.
As a side note:
It was pre-Katrina days when we were living aboard
in Point Cadet Marina in Biloxi, Ms. A named storm was coming and we had to evacuate. Those that did not were moved out and anchored by professional towing services hired by the marina - owned jointly by the city of Biloxi, the county and the Port commission. I'm pretty sure that the boat owners were hit with the bill. One boat was lost
. I didn't hear of any lawsuits, but it could have happened. Secrets don't exist in small towns when entrusted to everyday workers.