Very few (if any) Americans depend on the existence of the cruise industry to make a living or otherwise survive in our society. For the ones who do, it'd be cheaper to give them individual "bailouts". Cruise ships contribute jack all to the national or global supply chain except as consumers of it; letting cruise lines fail means more capacity on that supply chain for things that actually do matter (especially in times of crisis).

Even bank bailouts have a better value proposition, and that's saying something.