You could say the same thing about airlines, but no one is arguing about whether airlines are a necessary component of the economy.
I don't support a bailout for cruise lines, but I also don't support a bailout for airlines or any industry.
This pandemic crisis is being exploited on all fronts, and the first thing that everyone is going for is money. There is a lot of FUD being spread around as cause to bailout special interests, and that's a short term solution for a long term problem. It will only make things worse and more difficult in the end to correct the current problems at hand.
The focus shouldn't be on where to be spending money right now. The focus should be on developing proper procedures that at best prevents the next pandemic or at worst controls and minimizes its effect.