The thing is, they really HAVE to exempt themselves from liability just for such a case. They have to allow themselves a defense against lawsuits and charges when they had no option other than to do what they did because of circumstances beyond their control. If they didn't they'd run out of money really.
Every company has fine print. If they didn't they wouldn't be able to survive in today's world of lawsuits.
I hope everyone understands now like waters does that Carnival has to protect themselves, has given you a gift , and you have to make the most of it.