Are you sure about that? The cruise ships are not American and I'm not sure people have many "rights" to sue like they would in the USA and other countries. I think they protect themselves very, very well from litigation, and there are not the lawsuits for wrongful death, assault, rape, etc., that maybe there should be.
Not an expert, and definitely not a lawyer, but they protect themselves from so much liability it would not surprise me if we are all signing away lawsuit rights.