From your link - people had already been evacuated from places like China, cases were spreading around the world, and still people went on cruises and holidays. At what point do people have to take responsibility for their own poor decisions? They knew they should take the trip, and yet they did. I would view this differently if they went overseas before it was an international crisis, but afterward ??
"The sudden closure of borders and cancellation of flights shocked many Americans overseas, even though some admitted that relatives - or their own common sense - had advised them against leaving the United States in the first place."