The cruise ships send millions of dollars of US tourists' money every year to countries in the US sphere of influence that they would otherwise never fly and visit. It's not a bailout for the cruise industry. It's a bailout for nearly every island nation in this hemisphere. We keep the tourism money flowing and they'll keep flowing exported raw materials and food.
That's only true if you believe that there isn't some fundamental part of this business that is profitable and market forces won't eventually lead to new cruise companies popping back up in the future
Yes, I agree the system should not be that fragile, but for now it is.