Their sins was to assume that every place is like Middle America. They are guilty of being naive. This is very common in suburbia America.
I disagree. They committed no sin nor were they nieve. To say either is to blame the victims for being raped.
They signed up and paid very good money for a cruise/vacation. Vacations are to rest your worries, especially cruises. The assumption that all stops are vetted to be safe, else the ship wouldn’t go to that location.