Its irrelevant really. Imagine the Titanic disaster were to happen nowadays. Fats are poor, so they would be in the lower class, therefore lower down. The elevator is out of service due to sinking ship. Halls on ships are narrow, ditto staircases. Only a handful of smaller fats would be able to make it high enough to consider a lifeboat, but would lack the dexterity to get into said boat. Maybe if it was before the panic set in some white nights would ensure a few fats survived, but it has been proven over and over that in a disaster, the fats will die and take at least a few humans with them. Besides, the fats would be too loaded down with stuff they can't leave behind, or they would be too busy raiding the cafeteria to catch a lifeboat. Getting that beetus fix means more to them than their lives.