Oil, banks, insurance, defense contractors and certain technology companies are of vital importance to each country's national security. If necessary, governments will do what's necessary to try to prevent their demise.
While the cruise industry may get some government help, they are not considered a vital industry. Just look at the decades of history of the airline industry. There have been many
airline bankruptcies and restructurings over the years.
And even if companies survive bankruptcy, that doesn't mean that their shareholders of common stock will.